The Xerces XMLSchema infoset 2004-02-10 - By Mik Lernout
Dear,
Maybe a little background first:
I am in process of delivering a XOM-like java library to XMLSchema called
'endymion', that will be released under LGPL
as part of the 'narcissus'-project. The goal of the API is to offer a heavily
typed, java-like and simple access to the information
embedded in an XMLSchema.
At first I started of with parsing XMLSchema myself, but surrendered after a
while becaause of the complexity it brough upon combined
with the apparent liberal interpretations of the XMLSchema spec of some other
parsers. I decided on the XMLSchema infoset model (org.apache.xs.*)
in Xerces because it is light, has active developers and tries to adhere to
specs.
But, of course, I am encountering some issues (let's call them challenges :-))
* I would like to validate XML to specific complex types in XMLSchema's. (so
without them being declared as XMLSchema instances...) I would also like to be
able to validate in memory DOM document trees / XOM document trees / JDOM
document trees / SAX parse events with a non Xerces parser /...
I think I am familiar enough with the Xerces internals to know that this should
not be that difficult. For example for the SAX Parser
I would only need to simulate an XNI-pass by making an adapter class that
implements DefaultHandler and translates all events to a XMLDocumentValidator
as if in a a XNI-pipeline. This adapter class seems to be pretty generic (can
make all XNI - XMLDocumentHandler act upon SAX events except for XNI events)
that I was wondering if it didn't already exist, or if somebody could give me
some tips with regards to this.
* I see that in CVS there have been several changes / updates with regards to
the visibility of fields and methods in several API classes. I was wondering
if there is a certain goal or reason for permorming these changes and when they
are finished / released. It would be really cool to have some public hooks
into the org.apache.xerces.impl.dv.xs.* - value-classes to be able to access
the actual values of DecimalDV and others.
I am very eager to contribute back any bug fixes / changes that I will develop
so even if you only have some guidelines as opposed to full fledged
solutions I will be very happy...
Mik
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