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You might consider implementing an ISO Schematron version of this.
ISO Schematron allows you to provide different languages instead of
XPath1. The schema just has an attribute
<sch:schema queryLanguage="stx" ...>
and your implementation rejects any schemas that do not use STX. ISO
Schematron already reserves the value "stx" to allow exactly what you
See the topic on Query Language Bindings in the Schematron spec at
Trapp, Tobias wrote:
> At the moment I'm experimenting with a prototype of a validation
> language similar to Schematron but based on STX
> (http://stx.sourceforge.net). I invented this language to perform checks
> that can't be coded with W3C XML Schema and apply it on XML documents
> are too big to be processed with XSLT or Schematron. I called this
> SVX (an acronym for Streaming Validation for XML).
> If you are interested in my work I refer to my blog :
> https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/3978 .
> In this blog I give a example for two arithmetical checks. The second
> uses a buffer to perform comparisons. In this blog you find a link to an
> XSLT-implementation that generates STX from a STV schema.
> I wonder whether there are other similar approaches. And if I didn't
> reinvent the wheel, do you think this approach could be worth for