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https://issues.apache.org/jira/browse/SIS-82?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux updated SIS-82:
-----------------------------------
Priority: Minor (was: Major)
> Metadata implementations could use a single field for union
> -----------------------------------------------------------
>
> Key: SIS-82
> URL: https://issues.apache.org/jira/browse/SIS-82
> Project: Spatial Information Systems
> Issue Type: Improvement
> Components: Metadata
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Priority: Minor
> Fix For: 0.3
>
>
> The ISO 19115 specification defines some properties as conditional. Most of
> the time, they are a set of mutually exclusive properties. For example the
> {{MD_Resolution}} class defines two properties: {{equivalentScale}} and
> {{distance}}, both of them flagged as conditional. The specification said:
> "_Only one of equivalent scale and ground sample distance may be provided_".
> Currently those two properties are defined in separated fields and could be
> defined together. We could replace the two private fields by a single private
> {{Object}} field, and use {{instanceof}} check in getter methods. The
> advantage would be:
> * Automatically gain enforcement of the ISO specification.
> * Save a little bit of memory space for metadata instances.
> One consequence is that if an XML document contains two properties, the last
> property would silently overwrite the previous one at unmarshalling time. To
> prevent such thing to happen silently, we would need the {{APPENDABLE}} mode
> proposed in SIS-81.
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