Re: [xml-dev] Common API for grammar-constraint

[Gareth Oakes <goakes@gpsl.co>]

Hi Christophe,

For the tools I’ve dealt with, Schematron is added as a second level of validation. Meaning you use DTD or Schema for fundamental validation of the document and then one or more Schematrons for identifying good/bad patterns. In the publishing space I haven’t encountered the use of Schematron for complete validation of documents (e.g. without an accompanying DTD or Schema).

Regarding RelaxNG, I think it is common practice to translate the RNG to W3C Schema, then use the Schema for validation. Some tools also take the same approach with DTDs - translate to Schema then use Schema for validation. I think DTDs can be “losslessly” represented as W3C Schema but if not others on this list will shoot me down :)

As to how to identify if a content edit is valid or invalid, I’m no expert but the first thing I’d try is to duplicate the DOM, edit the content in the second DOM, then try and validate that second DOM. If validation failed, the addition/change/deletion was not allowed :) If validation succeeded, throw away your original DOM and use the new one instead.

I suspect that algorithm will be slow and unwieldy for anything other than trivial documents. However, even if you go with a more optimised algorithm for validating changes, it might still be handy to keep the duplicate-DOM approach as a way of verifying your clever algorithms are functioning as expected.

// Gareth Oakes
// Chief Architect, GPSL
// www.gpsl.co








On 7/01/2016, 18:37, "Christophe Marchand" <cmarchand@oxiane.com> wrote:

>Hello,
>
>in a xml-editor context, I'm looking for an API which could give the 
>edition-possibilities on a node ( and a caret position), according to a 
>given grammar.
>The idea is to fill the completion popup in an editor, to allow/forbid 
>adds, deletes, moves, etc...
>
>I want to use many grammars (RelaxNG, XSD, Schematron), so I'm looking 
>for a tool/API which is common, or a unified result format.
>
>XSOM provides an object model from a XSD, which is interesting, but does 
>not support other grammars.
>I have no idea on how to validate a document-fragment (with a context, 
>if needed), I've found no API for this.
>
>Any hints on these subjects will be much appreciated.
>
>Best regards,
>Christophe
>
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