Added attribute augmentations for nc:Metadata and cui:PortionMarkingMetadata (#46)
The NDR is removing support for the structures:metadata and structures:relationshipMetadata attributes. Metadata properties can now be added to class types directly, via augmentation, or via extension.
For data types (representing a value, like a string or a number), element metadata properties cannot be attached directly. Instead, the NDR will now support attribute augmentations, which allow attributes to be created with representation term Ref and type xs:IDREFS. This XML Schema type allows a set of space-delimited xs:IDREF values, or pointers in XML.
Example schema changes from Core:
+ <xs:attribute name="portionMarkingMetadataRef" type="xs:IDREFS">
+ <xs:annotation>
+ <xs:documentation>An attribute reference to cui:PortionMarkingMetadata.</xs:documentation>
+ </xs:annotation>
+ </xs:attribute>
<xs:element name="PortionMarkingMetadata" type="cui:PortionMarkingMetadataType" nillable="true">
<xs:annotation>
<xs:documentation>Metadata about the Controlled Unclassified Information
(CUI) portion marking of a document.</xs:documentation>
</xs:annotation>
</xs:element>
The structures metadata attributes were very generic and did not convey what kind of information should be referenced. These new attribute augmentations have semantic names, making the requirements of a message specification clearer.
This approach should be used along with the new support for attribute wildcards in the structures schema, allowing message designers to attach declared attributes to NIEM-conformant complex types (classes or complex data types).
Added attribute augmentations for nc:Metadata and cui:PortionMarkingMetadata (#46)
The NDR is removing support for the
structures:metadataandstructures:relationshipMetadataattributes. Metadata properties can now be added to class types directly, via augmentation, or via extension.For data types (representing a value, like a string or a number), element metadata properties cannot be attached directly. Instead, the NDR will now support attribute augmentations, which allow attributes to be created with representation term
Refand typexs:IDREFS. This XML Schema type allows a set of space-delimited xs:IDREF values, or pointers in XML.Example schema changes from Core:
Example usage in a message:
The
structuresmetadata attributes were very generic and did not convey what kind of information should be referenced. These new attribute augmentations have semantic names, making the requirements of a message specification clearer.This approach should be used along with the new support for attribute wildcards in the
structuresschema, allowing message designers to attach declared attributes to NIEM-conformant complex types (classes or complex data types).