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 xmlns:pds="http://pds.nasa.gov/pds4/pds/v1"  
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    <Identification_Area>
        <logical_identifier>urn:nasa:pds:context:instrument:seis.vl2</logical_identifier>
        <version_id>1.0</version_id>
        <title>Seismomter for VL2</title>
        <information_model_version>1.21.0.0</information_model_version>
        <product_class>Product_Context</product_class>
        <Modification_History>
            <Modification_Detail>
                <modification_date>2024-04-11</modification_date>
                <version_id>1.0</version_id>
                <description>extracted metadata from PDS3 catalog and
                    modified to comply with PDS4 Information Model
                </description>
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        </Modification_History>
    </Identification_Area>

    <Reference_List>
        <Internal_Reference>
            <lidvid_reference>urn:nasa:pds:context:instrument_host:spacecraft.vl2::1.0</lidvid_reference>
            <reference_type>instrument_to_instrument_host</reference_type>
        </Internal_Reference>
        <External_Reference>
            <doi>10.1029/JS082i028p04524</doi>
            <reference_text>
                Anderson, D.L., et al., Seismology on Mars, 
                Journal of Geophysical Research, 82, 4524-4564, 
                doi:10.1029/JS082i028p04524, 1977.
            </reference_text>
        </External_Reference>
        <External_Reference>
            <doi>10.1126/science.194.4271.1318</doi>
            <reference_text>
                Anderson, D.L., et al., The Viking seismic experiment,
                Science, 194, 1318-1321, doi:10.1126/science.194.4271.1318, 1976.
            </reference_text>
        </External_Reference>
        <External_Reference>
            <doi>10.1016/0019-1035(72)90147-9</doi>
            <reference_text>
                Anderson, D.L., R.L. Kovach, G. Latham, 
                F. Press, M.N. Toksoz, and G. Sutton, Seismic investigations: 
                the Viking Mars lander, Icarus, 16(1), pp.205-216, 1972.
            </reference_text>
        </External_Reference>
        <External_Reference>
            <doi>10.1029/GL006i006p00499</doi>
            <reference_text>
                Nakamura, Y. and D.L. Anderson, 
                Martian wind activity detected by a seismometer at Viking lander 2 site,
                Geophysical Research Letters, 6(6), pp.499-502, 1979.
            </reference_text>
        </External_Reference>
        <External_Reference>
            <reference_text>
                Lazarewicz, A.R., et al., The Viking 
                seismometry final report, NASA Contractor Report 3408, 1981.
            </reference_text>
        </External_Reference>
    </Reference_List>
    
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        <name>Viking Lander Seismometer</name>
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            <ctli:Type_List>
                <ctli:type>Seismometer</ctli:type>
            </ctli:Type_List>
        </Type_List_Area>
        <description>
            The Viking Seismic Experiment was intended to
            observe ground motion on the surface of Mars and thereby determine the
            level of seismic activity on Mars, and deduce crustal properties and
            internal structure. It comprised a three-axis seismometer and data
            handling unit. The unit was mounted on the deck of each of the
            two Viking landers.
        </description>
    </Instrument>
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