https://bugzilla.wikimedia.org/show_bug.cgi?id=49186

       Web browser: ---
            Bug ID: 49186
           Summary: Property value parsing and validation should be done
                    (only) in the backend
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: WikidataRepo
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
    Classification: Unclassified
   Mobile Platform: ---

Property value parsing and validation should to be implemented in the backend,
and should be removed from JavaScript. Here's a few reasons:

* the web API has to validate input; validation needs parsing.
** we could restrict the API to a very simple format. This forces bot authors
to re-implement the parsing functionality in order to created the form we'd
required for the API from their input (notably, from Wikipedia)
* the backend needs to be able to render/format all values, for (non-JS)
display, RDF output, etc. Output formats should be parseable, providing
round-trip functionality. This is much easier if rendering and parsing is
implemented in the same place.
* parsing and formatting should only be implemented once, if at all possible.

In the backend, I suggest to allow any number of parsers for each data format.
Try each parser, until one accepts the input.

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