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From "Martin Desruisseaux (JIRA)" <>
Subject [jira] [Work started] (SIS-201) Citations.getIdentifier(Citation) should take Identifier.codeSpace in account
Date Fri, 29 May 2015 13:09:17 GMT


Work on SIS-201 started by Martin Desruisseaux.
> Citations.getIdentifier(Citation) should take Identifier.codeSpace in account
> -----------------------------------------------------------------------------
>                 Key: SIS-201
>                 URL:
>             Project: Spatial Information Systems
>          Issue Type: Improvement
>          Components: Metadata
>    Affects Versions: 0.3, 0.4, 0.5
>            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
> 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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