[jira] [Closed] (MARMOTTA-504) LDPath should have a null-coalescing selector

["Chris Beer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MARMOTTA-504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Beer closed MARMOTTA-504.
-------------------------------

       Resolution: Not a Problem
    Fix Version/s:     (was: 3.3.0)

> LDPath should have a null-coalescing selector
> ---------------------------------------------
>
>                 Key: MARMOTTA-504
>                 URL: https://issues.apache.org/jira/browse/MARMOTTA-504
>             Project: Marmotta
>          Issue Type: New Feature
>          Components: LDPath
>    Affects Versions: 3.2.1
>            Reporter: Chris Beer
>            Assignee: Jakob Frank
>
> Several LDPath programs I am working on would benefit from a null-coalescing selector (where the left-most existing match is returned by the selector), e.g. when there is a schema-defined titled type, but falling back to a more generic type would be better than no value at all, e.g.
> {code}
> name = madsrdf:authoritativeLabel || foaf:name || skos:prefLabel :: xsd:string;
> {code}
> The existing Union operator does deduplicate values, but in my use cases, the values are possibly not identical. 
> Here's a pull request to add the selector: 
> https://github.com/apache/marmotta/pull/5



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