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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-201) Citations.getIdentifier(Citation) should take Identifier.codeSpace in account
Date Fri, 29 May 2015 13:08:17 GMT
Martin Desruisseaux created SIS-201:
---------------------------------------

             Summary: Citations.getIdentifier(Citation) should take Identifier.codeSpace in
account
                 Key: SIS-201
                 URL: https://issues.apache.org/jira/browse/SIS-201
             Project: Spatial Information Systems
          Issue Type: Improvement
          Components: Metadata
    Affects Versions: 0.5, 0.4, 0.3
            Reporter: Martin Desruisseaux
            Assignee: Martin Desruisseaux
             Fix For: 0.6


In {{org.apache.sis.metadata.iso.citation.Citations}}, the {{getIdentifier(Citation)}} method
iterates over all {{Identifier}} instances and return the shortest {{Identifier.code}}, with
a preference with code that are valid Unicode identifier. There is two problems with this
approach:

* Returning the shortest identifier is an arbitrary choice. This strategy is a legacy of old
times when we did not checked for valid Unicode identifiers. In today context, this strategy
has undesirable effects: for the _International Association of Oil &amp; Gas producers_,
it causes the legacy OGP abbreviation to be preferred to the new IOGP abbreviation.
* The {{Identifier.codeSpace}} is ignored. It was not significant for the common case where
the main authorities where {{"EPSG"}} and {{"OGC"}}. But if we want to define an 19115 standard
in the ISO namespace, we need a string that take the namespace in account, for example {{"ISO:19115"}}.

Note that the last point may cause a difficulty with EPSG citation. In the old times, EPSG
was by itself an organization (_"European Petroleum Survey Group"_). But now EPSG is no longer
an organization, but is still an authority managed by another organization, namely IOGP. Do
we consider EPSG as an identifier in the IOGP namespace (i.e. {{"IOGP:EPSG"}})? Advantage
would be to provide a way to find the information to provide in the {{codeSpace}} attribute
of the following:

{code:xml}
<gml:identifier codeSpace="IOGP">urn:ogc:def:crs:EPSG::4326</gml:identifier>
{code}

Inconvenient is that most peoples use only {{"EPSG"}}, so it is not clear how to trim the
codespace in cases like this one.




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