Problems validating schemas with cyclical references

Question

I'm attempting to get two schemas to validate whereby each references a complextype from the other: both have different namespaces so I reference the other from each using '<import>'. This is no doubt a very dumb question but, what should I use as the 'schemalocation' attribute in the 'import' instructions? I have tried all variations I can think of including:
- the relevent xsi:schemaLocation value from the schema being imported
- the virtual path within the XMLDB directory structure e.g. /sys/schemas/PUBLIC/www.sepa.org/2007/XMLSchemas
- the same as above with the DB port included
I'm getting the following error which is very frustrating: LPX-00234: namespace prefix "loc" not declared. I certainly have declared it in both schemas, for some reason XMLDB isn't finding the schemalocations. Anyone know what I should be putting here?

Answer 1

Mark
the schemas were registered in the following way:
BEGIN
DBMS_XMLSchema.registerSchema(
schemaurl=>'http://www.sepa.org/2007/XMLSchemas/Locations.xsd',
schemadoc=>sys.UriFactory.getUri('/home/jsmyth/XSD/Locations.xsd')
,FORCE=>true
,LOCAL=>false);
END;
'Locations' is one schema, 'Licenses' is the other.
The relevant parts of the schemas are as follows, Licences first:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
     xmlns:lcn="http://www.sepa.org/2007/XMLSchemas/Licences"
     xmlns:loc="http://www.sepa.org/2007/XMLSchemas/Locations"
     xmlns:xdb="http://xmlns.oracle.com/xdb"
     targetNamespace="http://www.sepa.org/2007/XMLSchemas/Licences" elementFormDefault="qualified"
     attributeFormDefault="unqualified" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:SchemaLocation="http://www.sepa.org/2007/XMLSchemas/Licences.xsd">
     <xs:import namespace="http://www.sepa.org/2007/XMLSchemas/Locations" schemaLocation="http://www.sepa.org/2007/XMLSchemas/Locations.xsd"/>
     <xs:element name="Licences" xdb:defaultTable="Licences">
          <xs:complexType>
               <xs:sequence>
                    <xs:element ref="lcn:Licence" minOccurs="0" maxOccurs="unbounded"/>
               </xs:sequence>
          </xs:complexType>
     </xs:element>
     <xs:element name="Licence">
blah....
and,
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://www.sepa.org/2007/XMLSchemas/Locations"
     elementFormDefault="qualified" attributeFormDefault="unqualified"
     xmlns:loc="http://www.sepa.org/2007/XMLSchemas/Locations"
     xmlns:lcn="http://www.sepa.org/2007/XMLSchemas/Licences"
     xmlns:xdb="http://xmlns.oracle.com/xdb"
     xmlns:xs="http://www.w3.org/2001/XMLSchema"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.sepa.org/2007/XMLSchemas/Locations.xsd">
     <xs:import namespace="http://www.sepa.org/2007/XMLSchemas/Licences" schemaLocation="http://www.sepa.org/2007/XMLSchemas/Licences.xsd"/>
     <xs:element name="Locations" xdb:defaultTable="Locations">
          <xs:complexType>
               <xs:sequence>
                    <xs:element ref="loc:Location" minOccurs="0" maxOccurs="unbounded"/>
               </xs:sequence>
          </xs:complexType>
     </xs:element>
     <xs:element name="Location">
          <xs:complexType>
blah...
Thanks.