Re: [xml-dev] Problem with cascading XML Schemas

["bryan rasmussen" <rasmussen.bryan@gmail.com>]

That's a xerces error, nothing jumps out at me from your schemas
although there could be something my tired eyes aren't picking up, so
the problem is probably that xerces is parsing the definition twice
and then getting the conflict:
http://xerces.apache.org/xerces2-j/faq-grammars.html

Earlier versions of Xerces were notorious for this kind of problem, I
thought it was fixed by default with the newest version?

Cheers,
Bryan Rasmussen

On Fri, Jun 27, 2008 at 1:51 PM, Thorsten Rock
<thorsten.rock@werk-ii.com> wrote:
> For maximum scalability I want to use cascading xml schemas; for example one
> schema for basic datatypes (schema A), one for a group of applications
> (schema B) and one for the application itself (schema C). To keep everything
> clearly laid out, I'd prefer every schema to have it's own namespace.
>
> However, if I import schema A into schema B and then import schema B into
> schema C, I can't access schema A's datatypes from schema C.
>
> If I import schema A into schema B and then import schema A _and_ schema B
> into schema C, I get an validation error in schema C ("Warning - one of the
> grammar(s) returned from the user's grammar pool is in conflict with another
> grammar").
>
> SCHEMA A (schema_basic.xsd):
>
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema      xmlns           = "http://www.acme.org/basic";
>                targetNamespace = "http://www.acme.org/basic";
>                xmlns:xs        = "http://www.w3.org/2001/XMLSchema";>
>        <xs:simpleType name="smallRange">
>                <xs:restriction base="xs:integer">
>                        <xs:minInclusive value="2"/>
>                        <xs:maxInclusive value="5"/>
>                </xs:restriction>
>        </xs:simpleType>
> </xs:schema>
>
> SCHEMA B (schema_extended.xsd):
>
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema      xmlns:basic     = "http://www.acme.org/basic";
>                xmlns           = "http://www.acme.org/extended";
>                targetNamespace = "http://www.acme.org/extended";
>                xmlns:xs        = "http://www.w3.org/2001/XMLSchema";>
>        <xs:import namespace="http://www.acme.org/basic";
> schemaLocation="schema_basic.xsd"/>
>        <xs:simpleType name="extendedRange">
>                <xs:union memberTypes="basic:smallRange">
>                        <xs:simpleType>
>                                <xs:restriction base="xs:string">
>                                        <xs:enumeration value="more"/>
>                                </xs:restriction>
>                        </xs:simpleType>
>                </xs:union>
>        </xs:simpleType>
> </xs:schema>
>
> SCHEMA C (schema.xsd):
>
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema      xmlns:basic     = "http://www.acme.org/basic";
>                xmlns:ext       = "http://www.acme.org/extended";
>                xmlns           = "http://www.acme.org/specific";
>                targetNamespace = "http://www.acme.org/specific";
>                xmlns:xs        = "http://www.w3.org/2001/XMLSchema";>
>        <xs:import namespace="http://www.acme.org/basic";
> schemaLocation="schema_basic.xsd"/>
>        <xs:import namespace="http://www.acme.org/extended";
> schemaLocation="schema_extended.xsd"/>
>        <xs:element name="quantities">
>                <xs:complexType>
>                        <xs:sequence>
>                                <xs:element name="quantity"
> type="basic:smallRange"/>
>                                <xs:element name="large_quantity"
> type="ext:extendedRange"/>
>                        </xs:sequence>
>                </xs:complexType>
>        </xs:element>
> </xs:schema>
>
> What's my mistake here? What would be a sensible approach when I want to
> keep schema A, B and C in different namespaces?
>
> Thank you very much
> Thorsten Rock
>
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