Martin Desruisseaux created SIS-420:
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Summary: Forward references in XML
Key: SIS-420
URL: https://issues.apache.org/jira/browse/SIS-420
Project: Spatial Information Systems
Issue Type: Improvement
Components: Metadata
Affects Versions: 0.8, 0.7
Reporter: Martin Desruisseaux
In a metadata XML document, an element may be replaced by a reference to
another element. [Example derived from
catalog.data.gov|https://catalog.data.gov/harvest/object/d2901928-f55b-4ef3-88e9-9de7d3e30554]
(search {{Level_2}} in that document):
{code:xml}
<gmd:processStep>
<gmi:LE_ProcessStep>
<gmd:source xlink:href="#Level_2"/>
</gmi:LE_ProcessStep>
</gmd:processStep>
<gmd:source>
<gmd:LI_Source id="Level_2">
<gmd:description>
<gco:CharacterString>Source Contribution: The Level 2 data are used
in processing Level 3 data.</gco:CharacterString>
</gmd:description>
<gmd:LI_Source>
</gmd:source>
{code}
Support of such reference has been implemented in SIS-173, but only in the
cases where the content is defined before {{xlink:href}}. In above example, we
have the opposite order. Such forward references should be implemented in SIS.
One possible approach may be to to store the parent object and the property
name in a {{java.util.Map}} until the definition is found, in which case we can
use {{AbstractMetadata.asMap()}} for setting the final value.
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