Strange xmlns ???

[Eric Pailleau]

I have trouble with xmlns declarations in an XML I want to transform 
with a XSL file.

Here is a diff between the first (don't works) and the second (works)
< <EngDatMessage xmlns="toto" 
xmlns:xsi="http://www.w3.org/2001/XMLSchemainstance"; 
xsi:schemaLocation="toto ./schema.xsd">
---
> <EngDatMessage xmlns:xsi="http://www.w3.org/2001/XMLSchemaInstance"; 
xsi:noNamespaceSchemaLocation="schema.xsd">

With first declaration, Xalan outputs nothing but don't fail.
With second, everything works nice.
I don't understand the first declaration (A XML file that I received).
Is it a valid syntax ??? does anybody have seen/use it ?
Thanks a lot !