Support polymorphism in app-schema
----------------------------------
Key: GEOT-2674
URL: http://jira.codehaus.org/browse/GEOT-2674
Project: GeoTools
Issue Type: Improvement
Components: data app-schema
Reporter: Ben Caradoc-Davies
Assignee: Rini Angreani
Application schema support currently requires all property types to be known at
mapping time, so does not support polymorphism.
Application schemas often use polymorphism for data representation. For
example, GeoSciML 2.0 http://www.geosciml.org/geosciml/2.0/doc/ uses
gsml:CGI_ValuePropertyType containing a gsml:CGI_ValueType, which might be a
gsml:CGI_TermValueType or a gsml:CGI_NumericValueType. The use of
gsml:CGI_TermValueType is the canonical means of representing missing, unknown,
or withheld data, which numeric data should be represented using
For example, gsml:MappedFeature has a property gsml:positionalAccuracy of type
CGI_ValuePropertyType. Users want to be able to encode some features with:
<gsml:positionalAccuracy>
<gsml:CGI_TermValue>
<gsml:value
codeSpace="http://urn.opengis.net/";>urn:ogc:def:nil:OGC::missing</gsml:value>
</gsml:CGI_TermValue>
</gsml:positionalAccuracy>
and other features with:
<gsml:positionalAccuracy>
<gsml:CGI_NumericValue>
<gsml:principalValue uom="urn:ogc:def:uom:UCUM::m">500</gsml:principalValue>
</gsml:CGI_NumericValue>
</gsml:positionalAccuracy>
app-schema does not support this polymorphism.
Use cases are yet to be determined.
- Is it enough to have conditionals on mappings?
- Is polymorphism required for feature chaining, that is, different types of
chained feature depending on the source data behind the enclosing feature?
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