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Re: [xsl] How to access PSVI in XSLT3

2018-05-24 02:08:02
Practically, no, because (a) there isn't going to be another XSLT specification 
in the foreseeable future, and (b) there wouldn't be enough implementors to 
justify a standard.

Technically, schema validation is closely tied in with the XDM type system, and 
this has the consequence that XDM never exposes nodes for which validation has 
failed (that is to say, for which the outcome of validation is "invalid"). It 
would be possible to relax this, but it would need careful thought: it would 
involve a different kind of validation, in which (a) validation never causes a 
dynamic error, but (b) data that has been subjected to validation cannot be 
assumed to conform to the type against which it was validated.

There is also an effect on streaming. XSD is designed so that you know, while 
processing a start tag, what the type of the element is supposed to be; but you 
don't know until you hit the end tag whether the element is actually valid 
against that type. This means that if invalid data is to be made visible to the 
application, then in a streaming environment the PSVI data for an element can't 
be exposed until you reach the end tag.

Of course, there are applications for which it would be very useful to allow an 
invalid document to be processed and inspected, but it's probably a minority 
requirement.

Mi

On 24 May 2018, at 07:32, Mukul Gandhi 
gandhi(_dot_)mukul(_at_)gmail(_dot_)com 
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

On Wed, May 23, 2018 at 11:45 PM, Jason Polis jason(_at_)x-x(_dot_)net 
<mailto:jason(_at_)x-x(_dot_)net> 
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com 
<mailto:xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com>> wrote:
How can the PSVI be accessed in XSLT3 ?

 
 That's an interesting question. My naive feeling is, XSLT should provide a 
way to know, all prescribed PSVI information mention in XML Schema language. 
Is it practical to have this required, in the future XSLT spec (like XSLT 3.0 
2nd Edition or something similar)?



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Regards,
Mukul Gandhi
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