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add "x-ogc-definition" to the list of schema keywords #891

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Feb 28, 2024
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add "x-ogc-definition" to the list of schema keywords #891

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11 changes: 11 additions & 0 deletions extensions/schemas/standard/clause_7_schemas.adoc
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Expand Up @@ -126,6 +126,17 @@ In geospatial data, numeric property values often represent a measurement and ha

Communities or other OGC Standards can specify additional values for other unit languages, e.g., the https://www.qudt.org/doc/DOC_VOCAB-UNITS.html[QUDT Units] or https://www.opengis.net/def/uom[units registered in the OGC Rainbow]. For each language it must be specified how units have to be represented in the "x-ogc-unit" value.

NOTE: UCUM provides a language to define units while QUDT provides a units vocabulary. The term "language" is used as it is the broader term.

:req: definition
[#{req-class}_{req}]
[width="90%",cols="2,7a"]
|===
^|*Requirement {counter:req-num}* |/req/{req-class}/{req}
^|A |The keyword "x-ogc-definition" SHALL be used to identify the semantic definition for the property.
^|B |The value of the keyword "x-ogc-definition" SHALL be a URI.
|===

=== Example

The following example is the schema of a feature type that also includes additional keywords that apply to feature data (specified in the next Clause).
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