I don't find any help on that. I think that I know what it means. The error message is a little lame because it only points to the schema location. The element name is duplicated for no good reason (there would be no confusion if the two elements didn't have the same name)
Subject:Re: What does Unique Particle Attribution mean? Author:(Deleted User) Date:18 Nov 2002 04:45 AM
Hi Neil,
I agree that Xerces errors tend to be cryptic... As a rule, they cite the
same words used in the XML Schema specs: so your schema is not compliant
with the section 3.8.6 of the spec
(http://www.w3.org/TR/xmlschema-1/#cos-nonambig) that I am pasting here
Schema Component Constraint: Unique Particle Attribution
A content model must be formed such that during ·validation· of an= element
information item sequence, the particle contained directly, indirectly or
·implicitly· therein with which to attempt to ·validate· each item= in the
sequence in turn can be uniquely determined without examining the content
or attributes of that item, and without any information about the items in=
the remainder of the sequence.
If you send us the XML+XSD files you are using, we could help you find
what's wrong.