Using xml schema

[Alex Neth]

When using an xml schema, I am getting the error:

        myNamespace grammar not found

and can not figure out why. (myNamespace is actually a url of course)

The parser doesn't seem to be even finding the schema file, even though it
is in the same directory.  I have tried an absolute path as well.  Nothing
different happens if I move the schema file.

My document looks like:

<tag     xmlns="myNamespace"
            xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance";
            xsi:schemaLocation="myNamespace schema.xsd">
...
</tag>

and my schema looks like this:

<xsd:schema
            targetNamespace="myNamespace"
            xmlns="myNamespace"
            xmlns:xsd="http://www.w3.org/2000/10/XMLSchema";
            elementFormDefault="qualified">
...
</xsd:schema>

Is something wrong here?

Also, does validation have to be enabled in order to get the parser to load
the schema and apply fixed/default attribute values?

Any help is appreciated.

-Alex