gml:id should be unique per document
-------------------------------------
Key: GEOT-2627
URL: http://jira.codehaus.org/browse/GEOT-2627
Project: GeoTools
Issue Type: Bug
Components: core xml
Affects Versions: 2.6-M2
Reporter: Rini Angreani
Attachments: Encoder.patch
GeoServer will happily encode a nested feature that it has already seen,
including its gml:id attribute. Because the gml:id attribute is of XSD type ID,
it must only appear once in any document. XSD ID duplication causes a document
to be schema invalid. GeoServer should be modified to remember the gml:id of
every feature it sees and, instead of encoding a feature a second time, encode
a the containing property-type by reference, that is a property-type property
with xlink:href set as a relative URI.
For example, nstead of encoding:
<gsml:MappedFeature gml:id="mf.3">
<gsml:specification>
<gsml:GeologicUnit gml:id="gu.27">
...
<gsml:MappedFeature gml:id="mf.5">
<gsml:specification>
<gsml:GeologicUnit gml:id="gu.27">
...
GeoServer should encode:
<gsml:MappedFeature gml:id="mf.3">
<gsml:specification>
<gsml:GeologicUnit gml:id="gu.27">
...
<gsml:MappedFeature gml:id="mf.5">
<gsml:specification xlink:href="#gu.27" />
...
(note empty tag).
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