Thanks for the reply. I'll try to explain with an example below, and
any help you can give would be much appreciated.
I generate the bindings like this:
$ pyxbgen -u shape.xsd -m shape
$ pyxbgen -u circle.xsd -m circle
Now the following code works (using the circle package):
from pyxb.utils import domutils
from circle import CreateFromDOM
p = CreateFromDOM(domutils.StringToDOM(open("example.xml").read()))
But this doesn't (using the shape package)
from pyxb.utils import domutils
from shape import CreateFromDOM
p = CreateFromDOM(domutils.StringToDOM(open("example.xml").read()))
Now in this case I could just use circle, but what if I add circle,
pentagon, etc?
Because these are extensions I can't run pyxbgen on them all at once, and
because they're in different namespaces I shouldn't have to.
example.xml:
<?xml version="1.0"?>
<picture xmlns="http://www.example.com/shape";
xmlns:c="http://www.example.com/circle";>
<name>Example Picture</name>
<shapes>
<square>
<size>5</size>
</square>
<c:circle>
<c:radius>10</c:radius>
</c:circle>
</shapes>
</picture>
shape.xsd:
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
targetNamespace="http://www.example.com/shape";
xmlns="http://www.example.com/shape";
elementFormDefault="qualified">
<xs:element name="picture">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="xs:string"/>
<xs:element name="shapes" type="ShapesType"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:complexType name="ShapesType">
<xs:sequence>
<xs:element ref="shape" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:element name="shape" type="ShapeType"/>
<xs:complexType name="ShapeType"/>
<xs:element name="square" substitutionGroup="shape">
<xs:complexType>
<xs:complexContent>
<xs:extension base="ShapeType">
<xs:sequence>
<xs:element name="size" type="xs:int"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
</xs:schema>
circle.xsd:
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:shp="http://www.example.com/shape";
targetNamespace="http://www.example.com/circle";
xmlns="http://www.example.com/circle";
elementFormDefault="qualified">
<xs:import namespace="http://www.example.com/shape";
schemaLocation="shape.xsd"/>
<xs:element name="circle" substitutionGroup="shp:shape">
<xs:complexType>
<xs:complexContent>
<xs:extension base="shp:ShapeType">
<xs:sequence>
<xs:element name="radius" type="xs:int"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
</xs:schema>
Thanks again, Sorry for the long post.
Jon
On 22/02/11 14:17, Peter Bigot wrote:
It's been a while since I've done anything with PyXB, so I may be
rusty. But what you're describing is supposed to just work.
PyXB maintains a registry of known namespaces, which is initialized
when a module is loaded. As a document is processed, the relevant
namespace should be resolved and its content model used.
Although each module contains helper functions CreateFromDocument and
CreateFromDOM, these should only provide a default namespace. You
should be able to process a document that has full namespace
information by using any of the CreateFromDOM functions. (The
document must include the necessary xmlns:foo="uri" namespace
declarations to map the namespace qualifiers to the actual namespaces
which are URIs.)
If the document uses an absent namespace, then you have to use the
CreateFromDOM function from the correct module, or identify the
correct Namespace instance and provide it. (These functions also
provide the option of overriding the default namespace, though I see a
potential bug in that CreateFromDocument ignores it in favor of the
module namespace.)
I thought I had some multiple namespace examples in the manual, but I
don't see them offhand. From the distribution, examples/xsdprimer
shows an example of a document that uses multiple namespaces, as would
anything involving the OGC schema.
If you continue to have problems, please provide a pointer to a set of
example schema and a document, along with the application code that
isn't doing what you think it should, and I'll take a look.
Peter
On Tue, Feb 22, 2011 at 6:19 AM, Jon Siddle <j...@corefiling.co.uk
<mailto:j...@corefiling.co.uk>> wrote:
I'm looking at using pyxb for providing an extension mechanism and
could
do with some guidance.
Say I have a.xsd which provides a namespace containing the head of a
substitution group, and b.xsd which provides a separate namespace
and contains elements which can be substituted.
I can generate module a and module b, and I can successfully parse an
xml file using b.CreateFromDOM but not a.CreateFromDOM.
My problem is that b.xsd (and later c.xsd) will be introduced long
after
a.xsd. So once I've added c.xsd (module c), how do
I process a file which contains substitutions from both b and c?
I don't think this is specific to substitution groups at all. More
generally, if I have an XML file containing multiple namespaces;
how do
I parse
it?
Jon
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