Re: 'Re: [xml] "Next XML schema implementation steps (poll)"'

On Thu, Aug 19, 2004 at 11:04:24AM +0200, Kasimier Buchcik wrote:

on 8/18/2004 6:50 PM Bryan Berkowitz wrote:
 > Kasimier Buchcik wrote:
 >>Yes, <key>, <keyref> and <unique> are not supported yet.

Could we add these features to the list of things to do? I would find 
them very useful, in fact I might be able to help out with the 

That would be great! :-)
For parsing those elements I recommend looking at 
"xmlSchemaParseSimpleType" in xmlschemas.c; there you'll find an example 
  of how to use the new error functions, and of validation of attributes 
and their values.

The main issues I see here:
1. how to restrict the XPath expressions as imposed by the spec
2. just keep in mind that the XPath execution should be able to work on 
a stream someday (as mentioned by Daniel)

  I noticed that I missed that point. The code for this is the pattern
engine (include/libxml/pattern.h & pattern.c), but it's too limited right
now (namespaces are not implemented for example), and a push/pop API would
be needed for real streaming.

  Among the features missing of the schemas implementation, there is the
need of a streaming interface, right now we validate only trees, I believe
the current implementation should be able to work after some refactoring
based on a SAX2 stream, but it's not a piece of cake.


Daniel Veillard      | Red Hat Desktop team
veillard redhat com  | libxml GNOME XML XSLT toolkit | Rpmfind RPM search engine

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