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Question about XML-Schema choice structure.

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If I define the following schema which allows either a tag element OR
an tag and origin_system elements I get an error. Same thing happens
when I use groups. Is this because tag is defined twice? My reading of
the XML-Schema spec seems to suggest that the schema is valid & that
Xerces is in error.

I get the error with Java Xerces 2.3.0 but not with C++ Xerces 1.7.0.

Can anyone explain?

Here's the error...

error [4,16] cvc-complex-type.2.4.a: Invalid content starting with
element 'origin_system'. The content must match

Here's the schema....

<?xml version="1.0"?>
<xsd:schema xmlnssd="">

<xsd:element name="fx" type="fx_type"/>

<xsd:complexType name="fx_type">
<xsd:element name="tag" type="xsd:string" minOccurs="1"
<xsd:element name="tag" type="xsd:string" minOccurs="1"
<xsd:element name="origin_system" type="xsd:string"
minOccurs="1" maxOccurs="1"/>


Heres the XML...

<?xml version="1.0" encoding="UTF-8"?>
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