Hi
Some help would be appreciated wrt eliminating the hardcoded schema location
from a schema which derives its types from base schema types.
If the base schema location is not hardcoded in the derived schema the
following XmlSchemaException occurs (even though the base Schema has been
successfully added to the schema cache) ...
An unhandled exception of type 'System.Xml.Schema.XmlSchemaException'
occurred in system.xml.dll
Additional information: System error.
Unhandled Exception: System.Xml.Schema.XmlSchemaException: Undefined
complexType 'urn:schemas-x-com:base:BaseComplexType' is used as a base for
complex type extension". An error occurred at
file:///C:/Temp/ExtensionSchema.xsd, (7, 5).
Please note that I am posting to this forum as it's my understanding that
schema resolution is the responsability of the implementing parser (.Net)
and not an XSD specification issue.
The schemas and instance document are reproduced below...
**************
BaseSchema.xsd
**************
<?xml version="1.0" encoding="utf-8" ?>
<xs:schema id="BaseSchema" targetNamespace="urn:schemas-x-com:base"
elementFormDefault="qualified"
xmlns="urn:schemas-x-com:base" xmlns:xs="http://www.w3.org/2001/XMLSchema";>
<xs:complexType name="BaseComplexType">
<xs:sequence />
<xs:attribute name="name" type="xs:string" use="required" />
</xs:complexType>
<xs:element name="Base" type="BaseComplexType"></xs:element>
<xs:element name="BaseContainer">
<xs:complexType>
<xs:sequence>
<xs:element ref="Base" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
*******************
ExtensionSchema.xsd
*******************
<?xml version="1.0" encoding="utf-8" ?>
<xs:schema id="ExtensionSchema"
targetNamespace="urn:schemas-y-com:extension" elementFormDefault="qualified"
xmlns="urn:schemas-y-com:extension" xmlns:base="urn:schemas-x-com:base"
xmlns:xs="http://www.w3.org/2001/XMLSchema";>
<!-- <xs:import namespace="urn:schemas-x-com:base"
schemaLocation="file:///C:/Temp/BaseSchema.xsd" /> -->
<xs:complexType name="DerivedComplexType">
<xs:complexContent mixed="true">
<xs:extension base="base:BaseComplexType">
<xs:sequence>
<xs:element ref="DerivedEntity" />
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:element name="DerivedEntity" type="xs:string"></xs:element>
</xs:schema>
***************
DerivedTest.xml
***************
<?xml version="1.0" encoding="utf-8" ?>
<BaseContainer xmlns="urn:schemas-x-com:base"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:e="urn:schemas-y-com:extension">
<Base name="arg4"
xsi:type="e:DerivedComplexType"><e:DerivedEntity>Derived</e:DerivedEntity></
Base>
</BaseContainer>
*****************************
C# validation code snippet...
*****************************
string testFln = "C:\\Temp\\DerivedTest.xml";
XmlTextReader txtRdr = new XmlTextReader(testFln);
XmlSchemaCollection xsc = new XmlSchemaCollection();
string baseSchemaURI = "file:///C:/Temp/BaseSchema.xsd";
xsc.Add("urn:schemas-x-com:base", baseSchemaURI);
string derSchemaURI = "file:///C:/Temp/ExtensionSchema.xsd";
//throws the XmlSchemaException if the xs:import is commented out in the
derived schema
xsc.Add("urn:schemas-y-com:extension", derSchemaURI);
XmlValidatingReader valRdr = new XmlValidatingReader(txtRdr);
valRdr.ValidationType = ValidationType.Schema;
valRdr.Schemas.Add(xsc);
valRdr.ValidationEventHandler +=
new ValidationEventHandler(IDefValidationEventHandler);
while (valRdr.Read())
{
}
valRdr.Close();
