Martin Desruisseaux created SIS-591:
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Summary: Construct CRS from GML splitted in many files
Key: SIS-591
URL: https://issues.apache.org/jira/browse/SIS-591
Project: Spatial Information Systems
Issue Type: Improvement
Components: Referencing
Reporter: Martin Desruisseaux
Assignee: Martin Desruisseaux
Fix For: 1.5
Apache SIS 0.7 and later can read a CRS definition in GML, but all components
have to be in a single file. But the CRS definitions provided by EPSG use
{{xlink:href}} instead for referring to definitions in external documents. SIS
automatically follows {{xlink:href}} when they are in the same document (except
for forward references, which are not yet supported), but this is not
sufficient for parsing an EPSG definition.
We need to follow {{xlink:href}} to external files. This task is described by
SIS-387 for the metadata part, but the same issue applies to CRS definitions.
This task is needed for OGC Testbed-19 for the definitions of CRS in space, but
should have the side-effect of allowing parsing CRS definition provided online
by the EPSG registry in GML. So it should not be necessary anymore for users to
install the EPSG database if fetching the definition online is acceptable, and
they would always get the latest definition from EPSG.
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