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Browse SpaceOpenGIS Catalog Services Specification (OGC 02-087r3) defines the concept of Catalog and Catalog Entry, in addition to providing model (and BNF query language) for interacting with Metadata.
 | WRS seems to be subsummed as a CAT profile |
WRS is cross referenced with Abstract Specificaiton Topic 13: Catalog Services.
Defines the following terms:
- Feature Catalog
- Catalog containing definitions and descriptions of the feature types, feature attributes, and
feature relationships occurring in one or more sets of geographic data, together with any
feature operations that may be applied [GEOTOOLS:ISO 19101], [GEOTOOLS:ISO 19110]
- Catalog containing definitions and descriptions of the feature types, feature attributes, and
- Geographic Dataset
- Dataset with a spatial aspect ISO 19115
- metadata dataset
- Metadata describing a specific dataset [GEOTOOLS:ISO 19101]
- metadata entity
- Group of metadata elements and other metadata entities describing the same aspect of data
- NOTE 1 A metadata entity may contain one or more metadata entities
- NOTE 2 A metadata entity is equivalent to a class in UML terminology ISO 19115
- Metadata Schema
- Conceptual schema describing metadata
- NOTE ISO 19115 describes a standard for a metadata schema. [GEOTOOLS:ISO 19101]
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The split between using the Filter spec against features and against metadata is tough to take at the API level.
Degree went with:
I recommended to GeoAPI:
Non of these solutions is good, tempted to define SFSQL as the query language and leave it as that.