| class  | ChecksumManifest | The Checksum_Manifest class defines a two column
         table for file references and checksums. | 
| class  | Header | The Header class describes a data object
         header. | 
| class  | Inventory | The Inventory class defines the inventory for
         members of a collection. | 
| class  | ManifestSIPDeepArchive | The Manifest SIP Deep Archive class is a Table
         Delimited for the NASA planetary science deep archive's
         Submission Information Package (SIP). | 
| class  | ServiceDescription | The Service Description class defines a file
         that contains a standardized service
         specification. | 
| class  | SPICEKernel | The SPICE Kernel class describes a SPICE
         object. | 
| class  | StreamText | The Stream text class defines a text
         object. | 
| class  | TableDelimited | The Table_Delimited class defines a simple table
         (spreadsheet) with delimited fields and
         records. | 
| class  | TableDelimitedSourceProductExternal | The Table_Delimited_Source_Product_External
         class defines a table that references many source products
         (products containing input data for the creation of this
         product) outside the PDS4 Registry that have a common
         reference_type, doi, curating facility, and/or description. | 
| class  | TableDelimitedSourceProductInternal | The Table_Delimited_Source_Product_Internal
         class defines a table that references many source products
         (products containing input data for the creation of this
         product) in the PDS4 registry system. | 
| class  | XMLSchema | The XML Schema class defines a resource used for
         the PDS4 implementation into XML. |