Schematron using XPath 2.0
//proc:Input_Product_List/pds:Internal_Reference/Rule
PROC:error: pds:reference_type must have value 'data_to_input_product'
//proc:Input_Product_List/pds:Local_Internal_Reference/Rule
PROC:error: pds:reference_type must have value 'data_to_input_product'
//proc:Parameter/pds:Internal_Reference/Rule
PROC:error: pds:reference_type must have value 'parameter_to_data_object'
//proc:Parameter/pds:Local_Internal_Reference/Rule
PROC:error: pds:reference_type must have value 'parameter_to_data_object'
//proc:Processing_Information/pds:Local_Internal_Reference/Rule
PROC:error: pds:local_reference_type must have value 'processing_information_to_data_object'
//proc:Software/pds:Internal_Reference/Rule
PROC:error: pds:reference_type must have value 'data_to_software'
//proc:Software/proc:software_availability/Rule
PROC:error: The attribute proc:Software/proc:software_availability must be equal to one of the following values 'Open source', 'Released', 'Proprietary', 'Unreleased'.
proc:Parameter/proc:parameter_type/proc:parameter_type
The attribute proc:Parameter/proc:parameter_type must be equal to one of the following values 'Input', 'Log', 'Output'.
proc:Software/proc:software_availability/proc:software_availability
The attribute proc:Software/proc:software_availability must be equal to one of the following values 'Open source', 'Proprietary', 'Released', 'Unreleased'.