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Re: XPath for Infoset extensions [was Annotations in XPath-NG?


Re:  XPath for Infoset extensions [was Annotations in XPath-NG?
> John Cowan and I have been pushing around the idea that it should be a
> requirement on 'official' infoset extensions that they come with a
> serialisation.  I'd like to see this happen, for example along the
> lines of the various reflections Richard Tobin and I have explored for
> the PSVI.  It would be a simple step to allow XPaths to navigate
> extensions via a pretend reflection.  All that's required is a
> function 'reflect(property)', whose value would be a reflection of the
> value of an infoset property of the current node.  So, for instance,
> to access the appinfo annotation of the type used to validate an
> 'apple' element child of the current node, you'd say:
> 
>   apple/reflect("type_definition")/annotation/appinfo
> 
> You could of course navigate the vanilla infoset this way.  The
> equivalent of /*/apple/@banana would look like
> 
>   /property("document_element")/children/element[local_name="apple"]/attributes/attribute[local_name="banana"]


I have been slow to come to agreement.  I've always thought there should be 
many alternative ways to represent the Infoset, but I think in light of the 
whole XPath discussion, that I do finally agree.  A standard serialization for 
Inforset extensions, based on the XPath 1.0 data model, or minor extensions 
thereof, could be a lynch pin for an annotation and declarations framework for 
XPath-NG.

That having been said, I hope we don't end up with the horrible name "reflect" 
for the function.  I've always hated the terms "reflection" and 
"introspection" in their current CS sense because of their meaninglessness in 
the light of general English usage.


-- 
Uche Ogbuji                                    Fourthought, Inc.
http://uche.ogbuji.net    http://4Suite.org    http://fourthought.com
Apache 2.0 API - http://www-106.ibm.com/developerworks/linux/library/l-apache/
Python&XML column: Tour of Python/XML - http://www.xml.com/pub/a/2002/09/18/py.
html
Python/Web Services column: xmlrpclib - http://www-106.ibm.com/developerworks/w
ebservices/library/ws-pyth10.html



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