Why are no namespace attributes validated by schema.

[wooks]

I apologise if this has been asked before, it is a bit hard to search
for.

I have an xml schema which defines the elements in the namespace
"urn:dummy". The schema does not contain any attribute
definitions/declarations.

The instance XML however gets transformed at runtime with the result
that a label attribute is added to each element.

An example of my instance XML is below

<?xml version="1.0"?>
<ROOTSTUB xmlns="urn:dummy">
<a label="Name">login</a>
<b label="derivation">restriction</b>
<c label="XML Data Type">NCName</c>
<d label="Minimum Field Length">6</d>
</ROOTSTUB>

Post transformation, errors are being thrown up because the validating
XML schema has no attribute definitions.

My question is given that the label attributes are not in any
namespace why are they being validated by the XML schema?

 

[Martin Honnen]

I apologise if this has been asked before, it is a bit hard to search
for.

I have an xml schema which defines the elements in the namespace
"urn:dummy". The schema does not contain any attribute
definitions/declarations.

Well then the elements are not allowed to have attributes.

The instance XML however gets transformed at runtime with the result
that a label attribute is added to each element.

An example of my instance XML is below

<?xml version="1.0"?>
<ROOTSTUB xmlns="urn:dummy">
<a label="Name">login</a>
<b label="derivation">restriction</b>
<c label="XML Data Type">NCName</c>
<d label="Minimum Field Length">6</d>
</ROOTSTUB>

Post transformation, errors are being thrown up because the validating
XML schema has no attribute definitions.

My question is given that the label attributes are not in any
namespace why are they being validated by the XML schema?

Because the schema defines the elements, you would need to allow
elements if you want to add them.

 

[Richard Tobin]

Post transformation, errors are being thrown up because the validating
XML schema has no attribute definitions.

My question is given that the label attributes are not in any
namespace why are they being validated by the XML schema?

There are two issues: are the attributes themselves valid? and are the
elements that they are attached to valid? Even if you don't want to
validate the attributes themselves, you have to declare that the
elements are allowed to have such attributes.

You need to use an attribute wildcard, and specify lax validation, e.g.

<anyAttribute namespace="##local" processContents="lax"/>

-- Richard