This XML schema file has been generated from the PDS4 Information Model. The Agency class provides a description of an entity that provides regional or national level governance over nodes within the federated Planetary Data System. The Alias class provides a single alternate name and identification for this product in this or some other archive or data system. The Alias_List class provides a list of paired alternate names and identifications for this product in this or some other archive or data system. The Archival Information Package (AIP) class defines an Information Package consisting of the Content Information and the associated Preservation Description Information (PDI), which is preserved within an archive that conforms to the Open Archive Information System (OAIS) Reference Model. The Array class defines a homogeneous N-dimensional array of scalars. The Array class is the parent class for all n-dimensional arrays of scalars. The Array 1D class is the parent class for all one dimensional array based classes. The Array 2D class is the parent class for all two dimensional array based classes. The Array 2D Image class is an extension of the Array 2D class and defines a two dimensional image. The Array 2D Map class is an extension of the Array 2D class and defines a two dimensional map. The Array 2D Spectrum class is an extension of the Array 2D class and defines a two dimensional spectrum. The Array 3D class is the parent class for all three dimensional array based classes. The Array 3D Image class is an extension of the Array 3D class and defines a three dimensional image. The Array 3D Movie class is an extension of the Array 3D class and defines a movie as a set of two dimensional images in a time series. The Array 3D Spectrum class is an extension of the Array 3D class and defines a three dimensional spectrum. The Axis Array class is used as a component of the array class and defines an axis of the array. The Band_Bin class specifies the characteristics of an individual spectral band in a spectral qube. The Band_Bin_Set class contains the spectral characteristics for all the spectral bands in a qube. The Bundle class describes a collection of collections. The Bundle Member Entry class provides a member reference to a collection. The Byte Stream class defines a stream of bytes. The Checksum_Manifest class defines a two column table for file references and checksums. The Citation_Information class provides specific fields often used in citing the product in journal articles, abstract services, and other reference contexts. The Collection class provides a description of a set of products. The Context Area provides context information for a product. The DD_Association class defines the association between two classes or a class and an attribute in a data dictionary. The DD_Association_External class defines the association between classes and attributes within the local data dictionary and those external to the local data dictionary. The DD_Attribute class defines an attribute for a data dictionary. The DD_Attribute_Full class provides a more complete definition of an attribute in the data dictionary. The DD Attribute Reference class provides a reference to an attribute using a namespace identifier and the attribute name. The DD_Class class defines a class for a data dictionary. The DD_Class_Full class provides a more complete definition of a class for a data dictionary. The DD Class Reference class provides a reference to a class using a namespace identifier and the class name. The DD_Permissible_Value class lists permissible values and their meanings. The DD_Permissible_Value_Full class lists permissible values, their meanings, and the dates when active. The DD_Rule class defines a Schematron rule for a data dictionary. The DD_Rule_Statement class defines a Schematron rule statement. The DD_Value_Domain class defines an attribute's permissible values and their constraints. The DD_Value_Domain_Full class provides a more complete definition of a attribute's value domain. The Dissemination Information Package Deep Archive class is an Information Package derived from one or more AIPs and is received by the National Space Science Data Center (NSSDC). The Data Set PDS3 class is used to capture the data set information from the PDS3 Data Set Catalog. The Discipline area allows the insertion of discipline specific metadata. The Display_2D_Image class provides attributes to enable the display of a 2 dimensional image. The Dissemination Information Package (DIP) class defines an Information Package, derived from one or more AIPs, that is received by a consumer. The Document class describes a document. A Document Edition is one complete version of the document in a set of files that is distinguished by language, a unique assemblage of file formats, or some other criteria. The Document File class describes a file which is a part of a document. The Element Array class is used as a component of the array class and defines an element of the array. The Encoded Binary class describes a binary encoded byte stream. This class is used to describe files in the repository that are being registered using Product_File_Repository. The Encoded Byte Stream class defines byte streams that must be decoded by software before use. These byte streams must only use standard encodings. The Encoded Byte Stream class is the parent class for all encoded byte streams. The Encoded Header class describes a header that has been encoded using an encoding scheme that is compliant to an external standard. The Encoded Image class is used for ancillary images in standard formats, such as JPEG. The Encoded Native class describes a binary encoded byte stream. This class is used to describe data objects for Product_Native. The External_Reference class is used to reference a source outside the PDS registry system. The External_Reference_Extended class is used to reference a source outside the PDS registry system. This extension is used in the local data dictionary. The Facility class provides a name and address for a terrestrial observatory or laboratory. The Field class defines a field of a record and is the parent class of all specific field classes.The Field class defines a field of a record or a field of a group and is the parent class of all specific field classes. The Field_Binary class defines a field of a binary record or a field of a binary group. The Field_Bit class provides parameters for extracting one field out of a string of bytes which contains packed data (that is, data values either smaller than a single byte, or crossing byte boundaries, or both. The Field_Character class defines a field of a character record or a field of a character group. The Field_Delimited class defines a field of a delimited record or a field of a delimited group. The Field Statistics class provides a set of metrics for a column formed by a field in a repeating record. The File class consists of attributes that describe a file in a data store. The File_Area class defines a File and its component data objects. The File Area Binary class describes a file that contains an encoded byte stream. The File Area Browse class describes a file and one or more tagged_data_objects contained within the file. The File Area Checksum Manifest class describes a file that contains a two column table for file references and checksums. The File Area Encoded Image class describes a file that contains an Encoded Image object. The File Area Inventory class describes a file and an inventory consisting of references to members. The File Area Native describes tagged_data_objects collected from an instrument. The File Area Observational class describes, for an observational product, a file and one or more tagged_data_objects contained within the file. The File Area Observational Supplemental class describes, for an observational product, additional files and tagged_data_objects contained within the file. The File Area SIP Deep Archive class describes the File Area for the Submission Information Package (SIP) for the NASA planetary science deep archive. The File Area SPICE Kernel class describes a file that contains a SPICE Kernel object. The File Area Service Description class describes a file that contains a service description. The File Area Text class describes a file that contains a text stream object. The File Area Transfer Manifest class describes a file that contains a two column table that maps the logical identifiers and version ids of products to their file specification names. The File Area XML Schema class describes a file that contains a resource used for the PDS4 implementation into XML. The Geometry class groups geometry information. The Group class defines a group of (repeating) fields and, possibly, (sub) groups; it is the parent class of all specific group classes. The Group_Field_Binary class allows a group of table fields. The Group_Field_Character class allows a group of table fields. The Field_Group_Delimited class allows a group of delimited fields. The Header class describes a data object header. The identification area consists of attributes that identify and name an object. The Information Package class defines the Information Package as described in the OAIS Reference Model and is the parent class of all specific IP classes. The Information_Package_Component class associates a Bundle, Collections or Basic Products with Checksum and Storage Manifests. The Information Package Component Deep Archive class is an Information Package Component for the NASA planetary science deep archive. The Ingest_LDD class provides a form for collecting class and attribute definitions. The Instrument class provides a description of a physical object that collects data. The Instrument Host class provides a description of the physical object upon which an instrument is mounted. The Instrument Host class provides a description of the phyiscal object upon which an instrument is mounted. This class captures the PDS3 catalog Instrument Host information. The Instrument class provides a description of a phyiscal object that collects data. This class captures the PDS3 catalog Instrument information. The Internal_Reference class is used to cross-reference other products in the PDS registry system. The Inventory class defines the inventory for members of a collection. The Investigation class provides a description of activities involved in the collection of data. The Investigation_Area class provides information about an investigation (mission, observing campaign or other coordinated, large-scale data collection effort). The Local Internal_Reference class is used to cross-reference other Description Objects in a PDS4 label. The Manifest SIP Deep Archive class is a Table Delimited for the NASA planetary science deep archive's Submission Information Package (SIP). The mission area allows the insertion of mission specific metadata. The Mission PDS3 class describes an activity involved in the collection of data. This class captures the PDS3 catalog Mission information. The Modification_Detail class provides the details of one round of modification for the product. The first, required, instance of this class documents the date the product was first registered. The Modification_History class tracks the history of changes made to the product once it enters the registry system. The NSSDC Information class provides identification information for data submitted to the NSSDC. The Node class provides a description of an entity that provides local governance within the federated Planetary Data System. The Object Statistics class provides a set of values that provide metrics about the object. The observation area consists of attributes that provide information about the circumstances under which the data were collected. The Observing System class describes the entire suite used to collect the data. The Observing System Component class references one or more subsystems used to collect data. A subsystem can be an instrument_host, instrument, or any other similar product. Each subsystem is categorized as either a sensor or a source. If the observing system includes both a sensor and a source, Observing System Component occurs twice (once for each type) otherwise it only occurs once. The Other class provides a description of activities involved in the collection of data which are not otherwise modeled. The PDS Affiliate class provides a description of a person who has an association with the planetary science community and has access to PDS resources not normally allowed to the general public. The PDS_Guest class is the default description of a person who has an association with the planetary science community and who has the most limited access to PDS resources. The Packed_Data_Fields class contains field definitions for extracting packed data from the associated byte string field. The Parsable Byte Stream class defines byte streams that have standard parsing rules. The Parsable Byte Stream class is the parent class for all parsable byte streams. The Primary_Result_Summary class provides a high-level description of the types of products included in the collection or bundle A Product is a uniquely identified object that is managed by a registry/repository. It consists of one or more tagged data objects. The Product AIP class defines a product for the Archival Information Package. The Product Attribute Definition provides an attribute definition in XML encoding. The Product Browse class defines a product consisting of one encoded byte stream digital object. A Product_Bundle is an aggregate product and has a table of references to one or more collections. The Product Class Definition provides a class definition in XML encoding. A Product_Collection has a table of references to one or more basic products. The references are stored in a table called the inventory. The Product Context class describes something that provides context and provenance for an observational product. The Product DIP class defines a product for the Dissemination Information Package. The Product DIP_Deep_Archive class defines a product for the Dissemination Information Package for the deep archive. The Data Set PDS3 product is used to create proxy labels for the data sets in the PDS3 Data Set catalog. A Product Document is a product consisting of a single logical document that may comprise one or more document editions. The Product File Repository class consists of a single text file. This product is used to register a file in a repository. The Product File Text consists of a single text file with ASCII character encoding. An Instrument Host product describes an instrument host. This product captures the PDS3 catalog instrument host information. An Instrument product describes an instrument. This product captures the PDS3 catalog instrument information. An Mission product describes a mission. This product captures the PDS3 catalog mission information. Product_Native is used to describe digital objects in the original format returned by the spacecraft or experimental system when that format cannot be described using one of the PDS4 formats specified for observational data (tables or arrays, excluding Array_1D). A Product_Observational is a set of one or more information objects produced by an observing system. The Product Proxy PDS3 class defines a product with enough information to register a PDS3 data product. The Product SIP class defines a product for the Submission Information Package. The Product SIP Deep Archive class defines a Submission Information Package (SIP) for the NASA planetary science deep archive. The Product SPICE Kernel class defines a SPICE kernel product. The Product Service class defines a product for registering services. Service descriptions from this product are used to register services as intrinsic registry objects. Product Software is a product consisting of a set of one or more software formats. The Product_Subscription_PDS3 class provides the list of subscriptions for a PDS3 subscriber. A target product describes a target. This product captures a reduced set of the PDS3 catalog target information. The Product Thumbnail class defines a product consisting of one encoded byte stream digital object. The Product Update class defines a product consisting of update information and optional references to other products. A Product Volume PDS3 product captures the PDS3 volume information. A Product Volume Set PDS3 product captures the PDS3 volume set information. The Product_XML_Schema describes a resource used for the PDS4 implementation into XML. The Product_Zipped is a product with references to other products. The referenced products and all associated products and files are packaged into a single ZIP file. The Property Map class defines a table consisting of a set of data elements and their values. The data elements in this table are considered to be locally defined and not subject to standards except for nomenclature rules. The property map entry consists of a property name and one or more values. The Property Maps class defines a collection of one or more related Property Maps. The Quaternion class models a mathematical construct that consists of four individual numeric components. Quaternions are a convenient mechanism for encapsulating orientation information since they require only four units of numeric storage, as opposed to the nine needed for a rotation matrix. The Quaternion_Component class provides a component of a quaternion. The Record class defines a record of a file and is the parent class of all specific record classes. The Record_Binary class is a component of the table class and defines a record of the table. The Record_Character class is a component of the table class and defines a record of the table. The Record_Delimited class is a component of the delimited table (spreadsheet) class and defines a record of the delimited table. The Reference_List class provides lists general references and cross-references for the product. References cited elsewhere in the label need not be repeated here. The Resource class provides a description of a web resource. The SIP Deep Archive class is a Submission Information Package (SIP) for the NASA planetary science deep archive. The SPICE Kernel class describes a SPICE object. The Science_Facets class contains the science-related search facets. It is optional and may be repeated if an product has facets related to, for example, two different disciplines (as defined by the discipline_name facet). Note that Science_Facets was modeled with Discipline_Facets as a component and Discipline_Facets was modeled with Group_Facet1 and Group_Facet2 as components. This dependency hierarchy was flattened and only Science_Facets exists in the schema. The Service Description class defines a file that contains a standardized service specification. The Software class describes a software product The Software Script class provides a description of a software code that is stored as a compiled binary file. The Software Script class provides a description of a software code that is stored as a script. The Software Script class provides a description of a software code that is stored as source code. The Special Constants class provides a set of values used to indicate special cases that occur in the data. The Stream text class defines a text object. The Submission Information Package (SIP) class is an Information Package that is delivered by a Data Provider to an archive that conforms to the Open Archive Information System (OAIS) Reference Model for use in the construction of one or more AIPs. The Subscriber PDS3 class provides the name of the subscriber and their subscription list. The Table Base class defines a heterogeneous repeating record of scalars. The Table Base class is the parent class for all heterogeneous repeating record of scalars. The Table Binary class is an extension of table base and defines a simple binary table. The Table Character class is an extension of table base and defines a simple character table. The Table_Delimited class defines a simple table (spreadsheet) with delimited fields and records. The Target class provides a description of a physical object that is the object of data collection. The Target_Identification class provides detailed target identification information. The Target class provides a description of a phyiscal object that is the object of data collection. This class captures the PDS3 catalog Target information. The Telescope class provides coordinates and parameters for terrestrial, ground-based telescopes. The terminological_entry class provides the name (designation) and definition of the attribute in a specified natural language. The Time_Coordinates class provides a list of time coordinates. The Transfer_Manifest class defines a table that maps product LIDVIDs to the file_specificaition_names of the products' XML label files. The Uniformly_Sampled class provides parameters for a uniformly sampled table. The Update class consists of update information. The Update Entry class provides the date and description of an update. The Vector class provides the components of either a velocity or position vector. The Vector_Cartesian_3_Base class is the parent class of 3 element Cartesian vectors. The Vector_Cartesian_3_Acceleration class is a 3 element Cartesian vector for acceleration coordinates. The Vector_Cartesian_3_Pointing class is a 3 element normalized Cartesian vector for pointing. The Vector_Cartesian_3_Position class is a 3 element Cartesian vector for position coordinates. The Vector_Cartesian_3_Velocity class is a 3 element Cartesian vector for velocity coordinates. The Vector_Component class provides a component of a vector. The Volume_PDS3 class is used to capture the volume information from the PDS3 Data Set Catalog. The Volume_Set_PDS3 class is used to capture the volume set information from the PDS3 Data Set Catalog. The XML Schema class defines a resource used for the PDS4 implementation into XML. The Zip class describes a zip file. This section contains the simpleTypes that provide more constraints than those at the base data type level. The simpleTypes defined here build on the base data types. This is another component of the common dictionary and therefore falls within the pds namespace. The abstract desc attribute provides a summary of a text, scientific article, or document. The abstract flag attribute indicates whether or not the class can be instantiated. Abstract flag is only included if a value of 'true' is desired and indicates that the class is abstract and cannot be used in a label. The acknowledgement_text attribute is a character string which recognizes another's contribution, authority, or right. The address attribute provides a mailing address. The affiliation type attribute describes the type of relationship an individual has with the PDS. Individuals with PDS affiliations are generally listed in the PDS Phone Book. The alternate_designation attribute provides aliases. The alternate_id attribute provides an additional identifier supplied by the data provider. The telephone_number attribute provides a telephone number in international notation in compliance with the E.164 telephone number format recommendation. The alternate _title attribute provides an alternate title for the product. The altitude attribute provides the height of anything above a given reference plane. The aperture attribute provides the diameter of an opening, usually circular, that limits the quantity of light that can enter an optical instrument. The ARCHIVE_STATUS attribute indicates the stage to which a data set has progressed in the archiving process, from IN QUEUE through ARCHIVED. It can also take on the values SUPERSEDED or SAFED, which indicate that the data set is not part of the active archive. ACCUMULATING can be appended to some values to indicate that the data set is incomplete and/or that not all components have reached the stage given by the root value; ACCUMULATING would be used, for example, when the archive is being delivered incrementally, as from a mission that lasts many months or years. The archive status note attribute provides a comment about the archive status. The attribute_concept attribute provides the type of information (classification) conveyed by the attribute -- e.g., stop_date_time has attribute_concept = date_time. The author_list attribute provides a list of people to be cited as the authors of the asssociated product. Lists are constructed with last names first and first and middle names and/or initials following. Initials are terminated by periods and delimited by single spaces. Suffixes (if applicable) follow everything else, after a final comma. Hyphenated names may be reduced to initials as "J.-P." Each person's full name is separated from the next by a semi-colon. There is no "and" before the last name. If there is no author list, editor_list must be present and non-null. The axes attribute provides a count of the axes. The axis_index_order attribute provides the axis index that varies fastest with respect to storage order. The axis_name attribute provides a word or combination of words by which the axis is known. The band_number attribute provides a number corresponding to the band in the spectral qube. The band number is equivalent to the instrument band number. The band_width attributes provides the width, at half height, of the band. The bit_fields attribute provides the number of defined bit fields (Field_Bit definitions) within the Packed_Data_Field. The bit_mask attribute is a series of binary digits identifying the active bits in a value; it has exactly the same number of the bits as the array element to which it is applied. The bundle_type attribute provides a classification for the bundle. The center_wavelength attribute provides the wavelength or frequency describing the center of a bin along the band axis of a spectral qube. When describing data from a spectrometer, the value corresponds to the peak of the response function for a particular detector and/or grating position. The checksum manifest checksum provides the checksum for the checksum manifest file. The checksum type attribute provides the name of the checksum algorithm used to calculate the checksum value. The citation_text attribute provides a character string containing a literature or other citation in sufficient detail that the material could be located in PDS or elsewhere. The class_name attribute provides the common name by which the class is identified, as well as the class within which the attribute is used. The collection_type attribute provides a classification for the collection. The comment attribute is a character string expressing one or more remarks or thoughts relevant to the object. The compile note attribute provides a brief statement giving particulars about the compilation of the software source. The conceptual_domain attribute provides the domain to which the value has been assigned. The confidence_level_note attribute is a text field which characterizes the reliability of data within a data set or the reliability of a particular programming algorithm or software component. Essentially, this note discusses the level of confidence in the accuracy of the data or in the ability of the software to produce accurate results. The constant value attribute provides the value to be used if an attribute is static. The container type attribute indicates the method used to package the components. The coordinate_source provides the name of the source of a set of coordinates. The copyright attribute is a character string giving information about the exclusive right to make copies, license, and otherwise exploit an object, whether physical or digital. country The creation_date_time attribute provides a date and time when the object was created. The curating_node_id attribute provides the id of the node currently maintaining the data set or volume and is responsible for maintaining catalog information. The data_regime attribute provides the wavelength (or an analogous concept for things like particle detectors) of the observations, stated as a category. The data_set_desc attribute describes the content and type of a data set and provides information required to use the data (such as binning information). The data set id provides a formal name used to refer to a data set. The data_set_name attribute provides the full name given to a data set or a data product. The data_set_name typically identifies the instrument that acquired the data of that instrument Example value data_set_id. Note This attribute is defined in the AMMOS Magellan catalog as an alias for file_name to provide backward compatibility The data_set_release_date attribute provides the date when a data set is released by the data producer for archive or publication. In many systems this represents the end of a proprietary or validation period. Formation rule In AMMOS identify the date at which a product may be released to the general public from proprietary access. AMMOS-related systems should apply this attribute only to proprietary data. A one line description of the data set The data_type attribute provides the hardware representation used to store a value in Element_Array. The date_time attribute provides the date and time of an event. The definition attribute provides a statement, picture in words, or account that defines the term. The description attribute provides a statement, picture in words, or account that describes or is otherwise relevant to the object. The detector_number attribute provides the spectrometer detector number corresponding to a band of a spectral qube. Detector numbers are usually assigned consecutively from 1, in order of increasing wavelength. The directory_path_name attribute provides a sequence of names that locates a directory in a hierarchy of directories. The document_editions attribute provides a count of the total number of complete, distinct editions of the document. The document_title attribute provides the full name of the published document. This optional attribute is used only if the title in the identification area of the document product is not sufficient. The document_standard_id attribute provides the formal name of a standard used for the structure of a document file. The doi attribute provides the Digital Object Identifier for an object, assigned by the appropriate DOI System Registration Agency. The radial "zone" or "shell" of the target for which the observations were collected or which are represented in the product(s). The value may depend on wavelength_range and size of the target. The edition name attribute provides a name by which the edition is known. The editor_list attribute provides a list of people to be cited as the editors of the associated product. Lists are constructed with last names first and first and middle names and/or initials following. Initials are terminated by periods and delimited by single spaces. Suffixes (if applicable) follow everything else, after a final comma. Hyphenated names may be reduced to initials as "J.-P." Each person's full name is separated from the next by a semi-colon. There is no "and" before the last name. The electronic mail address attribute provides a multi-part email address: the first part (the user name), which identifies a unique user, is separated by an "at sign" from the host name, which uniquely identifies the mail server. The element flag attribute indicates whether or not the class is defined as a xs:element in XML Schema. The elements attribute provides the count of the number of elements along an array axis. The encoding_standard_id attribute provides the formal name of a standard used for the structure of an Encoded Byte Stream digital object. The encoding_type attribute provides the storage format (binary or character). The enumeration_flag attribute indicates whether there is an enumerated set of permissible values. The error_constant attribute provides a value that indicates the original value was in error. The external_namespace_id attribute provides a namespace_id external to this context. The external_property_map_id attribute provides the identifier of a property_map instance external to this context. The external_property_maps_id attribute provides the identifier of a property_maps instance external to this context. The field_delimiter attribute provides the character that marks the boundary between two fields in a delimited table. The field_format attribute gives the magnitude and precision of the data value. The standard POSIX string formats are used. The field_length attribute provides the number of bytes in the field. The field_location attribute provides the starting byte for a field within a record or group, counting from '1'. The field_number attribute provides the position of a field, within a series of fields, counting from 1. If two fields within a record are physically separated by one or more groups, they have consecutive field numbers; the fields within the intervening group(s) are numbered separately. Fields within a group separated by one or more (sub)groups, will also have consecutive field numbers. The fields attribute provides a count of the total number of scalar fields directly associated with a group. Fields within (sub) groups of the group are not included in this count. The file_name attribute provides the name of a file. The file_size attribute provides the size of the file. The files attribute provides the number of files in the edition. The filter_number attribute of a spectral qube describes the physical location of a band (identified by the band_number) in a detector array. Filter 1 is on the leading edge of the array. The first_sampling_parameter_value element provides the first value in an ascending series and is therefore the minimum value at which a given data item was sampled. The formation_rule attribute provides a 'user friendly' instruction for forming values. The full_name attribute provides the complete name for a person and includes titles and suffixes. The grating_position attribute of a spectral qube describes the grating position which corresponds to the band. Grating positions are usually assigned consecutively from 0, and increasing position causes increasing wavelength for each detector. The group_length attribute provides the total length, in bytes, of a repeating field and/or group structure. It is the number of bytes in the repeating fields/groups plus any embedded unused bytes that are also repeated multiplied by the number of repetitions. The group_location attribute provides the starting position for a Group_Field_Binary within the containing Record_Binary or Group_Field_Binary class, in bytes. Location '1' denotes the first byte of the containing class. The group_number attribute provides the position of a group, within a series of groups, counting from 1. If two groups within a record are physically separated by one or more fields, they have consecutive group numbers; the intervening fields are numbered separately. Groups within a parent group, but separated by one or more fields, will also have consecutive group numbers. The groups attribute provides a count of the number of (sub)groups within the repeating structure of a group. (Subsub)groups within (sub)groups within the group are not included in this count. The high_instrument_saturation attribute specifies a special value whose presence indicates the measuring instrument was saturated at the high end. The value must be less than the value of the valid_minimum attribute or more than the value of the valid_maximum attribute. Values of this attribute should be represented in the same data_type as the elements in the object with which the Special_Constants class is associated. The high_representative_saturation attribute specifies a special value whose presence indicates the true value cannot be represented in the chosen data type and length -- in this case being above the allowable range -- which may happen during conversion from another data type. The value must be less than the value of the valid_minimum attribute or more than the value of the valid_maximum attribute. Values of this attribute should be represented in the same data_type as the elements in the object with which the Special_Constants class is associated. The identifier attribute provides the formal name used to refer to an object. The information_model_version attribute provides the version identification of the PDS Information Model on which the label and schema are based. The install note attribute provides a brief statement giving particulars about the installation of the software. The instance_id attribute provides the formal name of a single occurrence of an object. The institution_name attribute provides the name of the associated institution. The instrument_desc attribute describes a given instrument. The instrument_host_desc provides a description of an instrument host The instrument_host_id attribute provides a unique identifier for the host on which an instrument is located. This host can be either a spacecraft or an earth base (e.g. earth). The instrument_host_name attribute provides the full name of the platform or facility upon which an instrument or other device is mounted. For example, the host can be a spacecraft, a ground-based telescope, or a laboratory. The instrument_host_type attribute provides the type of host on which an instrument is based. For example instrument is located on a spacecraft instrument_host_type attribute would have the value SPACECRAFT. The instrument_host_version_id attribute provides the version of the instrument host. The instrument id provides a formal name used to refer to an instrument. The instrument_name attribute provides a unique name for an instrument. The instrument serial number element provides the manufacturer's serial number assigned to an instrument. This number may be used to uniquely identify a particular instrument for tracing its components or determining its calibration history, for example. The instrument_type attribute identifies the type of an instrument. Example values: POLARIMETER SPECTROMETER The Instrument_Version_Id element identifies the specific model of an instrument used to obtain data. For example, this keyword could be used to distinguish between an engineering model of a camera used to acquire test data, and a flight model of a camera used to acquire science data during a mission. The invalid_constant attribute provides a value that indicates the original value was outside the valid range for the parameter. The kernel_type attribute identifies the type of SPICE kernel. The keyword attribute provides one or more words to be used for keyword search. The language attribute provides the language used for definition and designation of the term. The last_modification_date_time attribute gives the most recent date and time that a change was made. The last_sampling_parameter_value element provides the last value in an ascending series and is therefore the maximum value at which a given data item was sampled. The ldd_version_id attribute provides the version of the Local Data Dictionary. The lid_reference attribute provides the logical_identifier for a product. The lidvid_reference attribute provides the logical_identifier plus version_id, which uniquely identifies a product. The line_display_direction element is the preferred orientation of lines within an image for viewing on a display device. Note that if this keyword is present in a label, the sample_display_direction keyword must also be present and must contain a value orthogonal to the value selected for this keyword. The local_identifier attribute provides a character string which uniquely identifies the containing object within the label. The local_identifier_reference attribute provides the value of the local_identifier of the entity described by the referencing class. Note that a local_identifier attribute, with the same value as this local_identifier_reference, must be present within the label. The local_mean_solar_time attribute provides the hour angle of the fictitious mean Sun at a fixed point on a rotating solar system body. The local_reference_type attribute provides the name of an association between an entity identified by a local_identifier_reference and another corresponding entity identified by a local_identifier. The values for the local_reference_type are expected to be enumerated for appropriate contexts in the Schematron files of local (i.e., discipline and mission) data dictionaries. The local_true_solar_time (LTST) attribute provides the local time on a rotating solar system body where LTST is 12 h at the sub-solar point (SSP) and increases 1 h for each 15 degree increase in east longitude away from the SSP for prograde rotation. A logical identifier identifies the set of all versions of an object. It is an object identifier without a version. The low_instrument_saturation attribute specifies a special value whose presence indicates the measuring instrument was saturated at the low end. The value must be less than the value of the valid_minimum attribute. Values of this attribute should be represented in the same data_type as the elements in the object with which the Special_Constants class is associated. The low_representative_saturation attribute specifies a special value whose presence indicates the true value cannot be represented in the chosen data type and length -- in this case being below the allowable range -- which may happen during conversion from another data type. The value must be less than the value of the valid_minimum attribute. Values of this attribute should be represented in the same data_type as the elements in the object with which the Special_Constants class is associated. The manifest checksum provides the checksum for the manifest file. The manifest url provides the URL to the manifest file. The maximum attribute provides the largest stored value which appears in the field over all records (empty fields and Special_Constants values are excluded). The maximum_characters attribute provides the upper, inclusive bound on the number of characters. The maximum_field_length attribute sets an upper, inclusive bound on the number of bytes in the field. The maximum occurrences attribute indicates the number of times something may occur. It is also called the maximum cardinality. The asterisk character is used as a value to indicate that no upper bound exists. The maximum_record_length attribute provides the maximum length of a record, including the record delimiter. The maximum_scaled_value attribute provides the maximum value after application of scaling_factor and value_offset (see their definitions; maximum_scaled_value is the maximum of Ov). The maximum_value attribute provides the upper, inclusive bound on the value. The md5_checksum attribute is the 32-character hexadecimal number computed for a file using the MD5 algorithm. The mean attribute provides the sum of the stored field values divided by the number of values in all records (empty fields and Special_Constants values are excluded from both the sum and the count). The median attribute provides the number separating the larger half of stored field values from the algebraically smaller half over all records (empty fields and Special_Constants values are excluded from the sort). The medium_type attribute identifies the physical storage medium for a data volume. Examples: CD-ROM, CARTRIDGE TAPE. The member_status attribute indicates whether the collection is primary and whether the file_specification_name has been provided for the product_collection label. The minimum attribute provides the algebraically smallest stored value which appears in the field over all records (empty fields and Special_Constants values are excluded). The minimum_characters attribute provides the lower, inclusive bound on the number of characters. The minimum occurrences attribute indicates the number of times something may occur. It is also called the minimum cardinality. The minimum_scaled_value attribute provides the minimum value after application of scaling_factor and value_offset (see their definitions; minimum_scaled_value is the minimum of Ov). The minimum_value attribute provides the lower inclusive bound on the value. The missing_constant attribute provides a value that indicates the original value was missing, such as due to a gap in coverage. The mission_desc attribute summarizes major aspects of a planetary mission or project, including the number and type of spacecraft, the target body or bodies and major accomplishments. The mission_name attribute identifies a major planetary mission or project. A given planetary mission may be associated with one or more spacecraft. The mission_objectives_summary attribute describes the major scientific objectives of a planetary mission or project. The mission_start_date attribute provides the date of the beginning of a mission in UTC system format. The mission_stop_date attribute provides the date of the end of a mission in UTC system format. The model_id attribute helps discriminate instrument hardware. For example "flight", "engineering", or "proto" have been used. The model_object_id attribute provides the unique identifier of a class, attribute, or value that is defined in the information model. The model_object_type attribute provides a classification for a modeled object. The modification_date attribute provides date the modifications were completed The naif_instrument_id element provides the numeric ID used within the SPICE system to identify the spacecraft, spacecraft structure or science instrument. The naif_instrument_id element provides the numeric ID used within the SPICE system to identify the spacecraft, spacecraft structure or science instrument. The name attribute provides a word or combination of words by which the Agency is known. The namespace_id attribute provides the abbreviation of the XML schema namespace container for this logical grouping of classes and attributes. It is assigned by the steward. The nillable_flag attribute indicates whether an attribute is allowed to take on nil as a value. The not_applicable_constant attribute provides a value that indicates the parameter is not applicable. An NSSDC Collection ID is an NSSDC assigned identifier for a collection of PDS datasets. The object_length attribute provides the length of the digital object in bytes. The offset attribute provides the displacement of the object starting position from the beginning of the parent structure (file, record, etc.). If there is no displacement, offset=0. The orbit_direction element provides the direction of movement along the orbit about the primary as seen from the north pole of the 'invariable plane of the solar system', which is the plane passing through the center of mass of the solar system and perpendicular to the angular momentum vector of the solar system orbit motion. PROGRADE for positive rotation according to the right-hand rule, RETROGRADE for negative rotation. The original_band attribute of a spectral qube provides the sequence of band numbers in the qube relative to some original qube. In the original qube, the values are just consecutive integers beginning with 1. In a qube which contains a subset of the bands in the original qube, the values are the original sequence numbers from that qube. The OS version attribute indicates the version of an operating system. The parsing_standard_id attribute provides the formal name of a standard used for the structure of a Parsable Byte Stream digital object. The pattern attribute provides a symbolic instruction for forming values. The phone_book_flag attribute indicates whether or not this person should be included in the phone book. The postal address text attribute provides a mailing address. The preferred_flag indicates whether this entry is preferred over all other entries. The primary_body_name attribute identifies the primary body with which a given target body is associated as a secondary body. The processing_level attribute provides a broad classification of data processing level. The processing_level_id attribute provides a broad indication of data processing level. The producer_full_name attribute provides the full_name of the individual mainly responsible for the production of the data set. This individual does not have to be registered with the PDS. The product_class attribute provides the name of the product class. The program notes id attribute provides an identifier to a brief statement giving particulars about a software program. The programmers manual id attribute provides an identifier to a document giving instruction about the programming of the software. The property name attribute provides a word or a combination of words by which a property is known. The property value attribute provides the value assigned to a property. The provider site id attribute provides an identifier for the provider. The publication_year attribute provides the year in which the product should be considered as published. Generally, this will be the year the data were declared "Certified" or "Archived". The purpose attribute provides an indication of the primary purpose of the observations included. The record_delimiter attribute provides the character or characters used to indicate the end of a record. The record_length attribute provides the length of a record, including a record delimiter, if present. The records attribute provides a count of records. The reference_text attribute provides a complete bibliographic citation for a published work. The reference_type attribute provides the name of the association. The registered_by attribute provides the name of the person or organization that registered the object. The registration_authority_id attribute provides the name of the organization that registered the object. The registration_date attribute provides the date of registration within the PDS system. The repetitions attribute provides the number of times a set of repeating fields and, possibly, (sub)groups is replicated within a group. The revision_id attribute provides the revision level of a document, which may be set outside PDS and may be different from its version_id. The rotation_direction element provides the direction of rotation as viewed from the north pole of the 'invariable plane of the solar system', which is the plane passing through the center of mass of the solar system and perpendicular to the angular momentum vector of the solar system. The value for this element is PROGRADE for counter -clockwise rotation, RETROGRADE for clockwise rotation and SYNCHRONOUS for satellites which are tidally locked with the primary. Sidereal_rotation_period and rotation_direction_type are unknown for a number of satellites, and are not applicable (N/A) for satellites which are tumbling. The rule_assign attribute provides an assignment statement for a schematron rule. The rule_context attribute provides the xpath for the rule. The rule_description attribute provides a description of the rule statement suitable for user documentation. The rule_message attribute provides a message to be displayed by the schematron processor when the test condition is met. The rule_test attribute provides the body of the statement to be executed by the schematron processor. The rule_type attribute indicates the type of statement to be executed. The rule_value attribute provides values to be used to complete certain schematon statements. The sample_display_direction attribute provides the preferred orientation of samples within a line for viewing on a display device. The attribute sample_display_direction must be used with line_display_direction. The sampling_parameter_interval element identifies the spacing of points at which data are sampled and at which a value for an instrument or dataset parameter is available. This sampling interval can be either the original (raw) sampling or the result of some resampling process. For example, in 48-second magnetometer data the sampling interval is 48. The sampling parameter (time, in the example) is identified by the sampling_parameter_name element. The sampling_parameter_name element provides the name of the parameter which determines the sampling interval of a particular instrument or dataset parameter. For example, magnetic field intensity is sampled in time increments, and a spectrum is sampled in wavelength or frequency. The sampling_parameter_scale element specifies whether the sampling interval is linear or something other such as logarithmic. The sampling_parameter_unit element specifies the unit of measure of associated data sampling parameters. The saturated_constant attribute provides a value that indicates the original value was invalid because of sensor saturation. The scaling_factor attribute is the scaling factor to be applied to each stored value in order to recover an original value. The observed value (Ov) is calculated from the stored value (Sv) thus: Ov = (Sv * scaling_factor) + value_offset. The default value is 1. The sequence_number attribute provides a number that is used to order axes in an array. The serial number element provides the assigned manufacturer's serial number. The software dialect attribute indicates the variety of a language used to write the software. The software format type attribute classifies the format of the software. The software id attribute provides a formal name used to refer to the software. The software language attribute identifies the language used to write the software. The software type attribute identifies the class of which the software is a member. The software_version_id attribute provides the version of the software. The solar_longitude attribute provides the angle between the body-Sun line at the time of interest and the body-Sun line at its vernal equinox. The sort name attribute provides a string to be used in ordering. For people, the last name (surname) is typically first, followed by a comma and then other names. The specified_unit_id attribute provides the unit chosen for maximum_value, minimum_value, and permissible_value. The standard_deviation attribute provides the standard deviation of values in the associated object; empty and Special_Constants values are excluded. The start_bit attribute provides the position of the first bit within an ordered sequence of bits. The start_date attribute provides the date when an activity began. The starting_point attribute provides the local_identifier of the object to be accessed first. The steward attribute indicates the person or organization that manages a set of registered attributes and classes. The stop-bit attribute provides the location of the last bit in this bit field relative to the first bit in the packed_data field. Bits are numbered continuously across byte boundaries. The first bit location in the packed data field is "1". The submitter_name attribute provides the name of the author, who submits the item to the steward. The subscriber_id provides the identification of a PDS subscription. The supported architecture note attribute identifies the hardware architecture that can process the software. The supported environment note attribute identifies the environment that can process the software. The supported operating system note attribute identifies the Operating System that supports the software. The system requirements note attribute identifies what is necessary to process the software. The target_desc attribute describes the characteristics of a particular target. The target_name attribute provides a name by which the target is formally known. The target_type attribute identifies the type of a named target. The team_name attribute provides the name of a group of individuals working together. The telephone_number attribute provides a telephone number in international notation in compliance with the E.164 telephone number format recommendation. The latitude attribute provides the angular distance north or south from the equator of a point on the object's surface, measured on the meridian of the point. The longitude attribute provides the angular distance east or west on the object's surface, measured by the angle contained between the meridian of a particular place and some prime meridian. The name given to the resource. Typically, a Title will be a name by which the resource is formally known. - Dublin Core - The title is used to refer to an object in a version independent manner. The transfer manifest checksum provides the checksum for the transfer manifest file. The type attribute classifies the attribute definition according to origin. The unit attribute provides the unit of measurement. The unit_of_measure_type attribute identifies the class from which the attribute being defined in this data dictionary draws its possible expressions for units. The unknown_constant attribute provides a value that indicates the original value was unknown. The url attribute provides a Uniform Resource Identifier (URI) that specifies where a resource is available and the mechanism for retrieving it. The users manual id attribute provides a formal name used to refer to a manual that describes how to use the software. The valid_maximum attribute specifies the maximum valid value in the field or digital object with which the Special_Constants class is associated. Values above the valid_maximum have a special meaning. Values of this attribute should be represented in the same data_type as the elements in the object or field described. (Note that PDS3 had no qube-related valid_maximum values because all special constants were set below the valid_minimum.) The valid_minimum attribute specifies the minimum valid value in the field or digital object with which the Special_Constants class is associated. Values below the valid_minimum have a special meaning. Values of this attribute should be represented in the same data_type as the elements in the object or field described. The value attribute provides a single, allowed numerical or character string value. The value_begin_date attribute provides the first date on which the permissible value is in effect. The value_data_type attribute is used in a data dictionary to specify the data type of an attribute's value. The value_end_date attribute provides the last date on which the permissible value is in effect. The value_meaning attribute provides the meaning, or semantic content, of the associated permissible value. The value_offset attribute is the offset to be applied to each stored value in order to recover an original value. The observed value (Ov) is calculated from the stored value (Sv) thus: Ov = (Sv * scaling_factor) + value_offset. The default value is 0. The vector_components attribute provides a count of vector components. The version_id attribute provides the version of the product, expressed in the PDS [m.n] notation. The volume_de_fullname attribute provide the full name of the data engineer. The volume_format attribute identifies the logical format used in writing a data volume. The volume_id attribute provides a unique identifier for a data volume. Example: MG_1001. The volume_name attribute contains the name of a data volume. The volume_series_name element provides a full, formal name that describes a broad categorization of data products or data sets related to a planetary body or a research campaign (e.g. International Halley Watch). A volume series consists of one or more volume sets that represent data from one or more missions or campaigns. The volume_set_id attribute identifies a data volume or a set of volumes. Volume sets are normally considered as a single orderable entity. Examples: USA_NASA_PDS_MG_1001, USA_NASA_PDS_GR_0001_TO_GR_0009 The volume_set_name element provides the full, formal name of one or more data volumes containing a single data set or a collection of related data sets. Volume sets are normally considered as a single orderable entity. The volume size attribute provide the number of bytes in the volume. The volume_version_id attribute identifies the version of a data volume. All original volumes should use a volume_version_id of 'Version 1'. The volumes element provides the number of physical data volumes contained in a volume set. The wavelength range attribute specifies the wavelength range over which the data were collected or which otherwise characterizes the observation(s). Boundaries are vague, and there is overlap. The x attribute provides the value of the x coordinate in a position vector. The y attribute provides the value of the y coordinate in a position vector. The z attribute provides the value of the z coordinate in a position vector. This section contains the base data types for PDS4 and any constraints those types may have. These types should be reused across schemas to promote compatibility. This is one component of the common dictionary and thus falls into the common namespace, pds. This section contains the base Units of Measure for PDS4. These Units of Measure should be reused across schemas to promote compatibility. This is one component of the common dictionary and thus falls into the common namespace, pds.