Johan Ditmar wrote:
Thank you Alberto. I thought about this, but if you look at my XML structure
(in which element names are instance names and object types are attributes), I
can't write a global schema enumerating all the objects (as they are
discriminated based on attribute rather than element name). Or can I? I'd
rather not modify the XML structure.
I hadn't looked at the sample XML; now that I read it, my approach is
not usable.
BTW, this format can give you troubles; be very careful when building
the schema, or, even better, preprocess the XML to shape it so that my
approach works.
Alberto
Johan
--- On Mon, 4/8/08, Alberto Massari <[EMAIL PROTECTED]> wrote:
From: Alberto Massari <[EMAIL PROTECTED]>
Subject: Re: Dynamically loading schemas whilst parsing
To: [email protected]
Date: Monday, 4 August, 2008, 11:39 AM
You cannot dynamically populate a schema while parsing (also because
when you get the notification of an element, that element has already
been validated); I would just build a big schema with the definitions
for the all the possible objects, with a definition for the root element
that allows any number of them (e.g. <xs:any namespace="##local"
maxOccurs="unbounded"/>)
Alberto
Johan Ditmar wrote:
Hi,
I am using Xerces-C++ to parse an XML document into a hierarchical object
structure. There are many different types of objects in this structure, each
corresponding to different XML, and I would like to use schema validation.
As I need to be able to parse any object structure, I can't use a
fixed schema that I know beforehand. Instead I would like to parse the XML, and
when I encounter the start of an object, I would like to dynamically load the
schema that is unique for that object and continue parsing and validating the
child elements of that object.
For example, my XML could look as follows:
...
<parent type="ObjA">
<child1 type="ObjB">
<name>Some Name</name>
</child1>
<child2 type="ObjC">
<value>Some Value</value>
</child2>
</parent>
Here, when I encounter ObjA during parsing, I want to load the schema of
Obj1, which validates that there should be two sub-elements, child1 and child2.
And this should be repeated for ObjB and ObjC.
The only way I can see this work at the moment is by parsing the structure
twice: once without validation to find all the objects and assemble the schema,
and once with validation. But I was wondering whether this can be done in one
pass. Any ideas?
Johan
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