Relax NG Schema error in Oxygen

Any idea on why we have such error in Oxygen with the RNG schema

SystemID: C:\Users\MoZ\Desktop\xml\xproc.rng
Endroit: 1018:14
Description: an "element" pattern containing an "attribute" pattern with a
non-null ID-type must have a name class that contains only "choice" and
"name" elements

SystemID: C:\Users\MoZ\Desktop\xml\xproc.rng
Endroit: 1044:14
Description: an "element" pattern containing an "attribute" pattern with a
non-null ID-type must have a name class that contains only "choice" and
"name" elements

SystemID: C:\Users\MoZ\Desktop\xml\xproc.rng
Endroit: 1124:14
Description: conflicting ID-types for attribute "id" from namespace "
http://www.w3.org/XML/1998/namespace" of element "catch" from namespace "
http://www.w3.org/ns/xproc"

If no idea, I gonna ask on Oxygen mailing list

Mohamed

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