xmlSchemaSet compile and xs:import error

[sachi...@gmail.com]

Hi,

I have following schema saved in new.xsd

<?xml version="1.0" encoding="utf-8"?>
<xs:schema
targetNamespace="http://www.smpte-ra.org/schemas/429.7/2006/CPL"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
xmlns:cpl="http://www.smpte-ra.org/schemas/429.7/2006/CPL"
elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:import namespace="http://www.w3.org/2000/09/xmldsig#"
schemaLocation="http://www.w3.org/TR/2002/REC-xmldsig-core-20020212/xmldsig-core-schema.xsd"/>
<xs:element name="CompositionPlaylist"
type="cpl:CompositionPlaylistType"/>
<xs:complexType name="CompositionPlaylistType">
<xs:sequence>
<xs:element name="Id" type="cpl:UUID"/>
<xs:element name="AnnotationText" type="cpl:UserText"
minOccurs="0"/>
<xs:element name="Signer" type="ds:KeyInfoType" minOccurs="0"/>
<xs:element ref="ds:Signature" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
<xs:simpleType name="UUID">
<xs:restriction base="xs:anyURI">
<xs:pattern
value="urn:uuid:[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="UserText">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="language" type="xs:language" use="optional"
default="en"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:schema>

I am using following code to add the schema to schemaset and compile.
Compile generates exception -
http://www.w3.org/2000/09/xmldsig#:KeyInfoType' is not declared.

Any suggestions as to what I may be doing wrong or what I need to do in
addition to this. Actually I need to validate XML against schema and I
am using XMLReaderSettings and was not able to create the xmlreader so
I just added compile statement to see if my SchemaSet.schemas has
everything and looks like the issue is with Schemaset since it is not
compiling also in .Net 2.0 Add does not compile the schema
automatically.

Suggestions will be of great help

[sachi...@gmail.com]

Missed the lil piece of code

try
{
XmlSchemaSet ss = new XmlSchemaSet();
ss.Add(null, "new.xsd");
ss.Compile();
}
catch(XmlSchemaException e)
{
Console.WriteLine(e);
}

[Priya Lakshminarayanan]

This is because the xml-dsig schema has DTD definition in it and by default
.NET XmlSchemaSet parses the schema with a reader that has ProhibitDtd =
true.
For your case, on XmlSchemaSet.Add(), you will get the following warning:

Exception Severity: Warning
Cannot resolve the 'schemaLocation' attribute.
An Error Occurred at: file:///E:/bugrepro/new1.xsd, (8,2)
Inner exception: System.Xml.XmlException: For security reasons DTD is
prohibited in this XML document. To enable DTD processing
set the ProhibitDtd property on XmlReaderSettings to false and pass the
settings into XmlReader.Create method.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.ParseDoctypeDecl()
at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.Schema.Parser.StartParsing(XmlReader reader, String
targetNamespace)
at System.Xml.Schema.Parser.Parse(XmlReader reader, String
targetNamespace)
at System.Xml.Schema.Preprocessor.LoadExternals(XmlSchema schema)
System.Xml.Schema.XmlSchemaImport 8 2

In order to be able to parse schemas that have DTDs in them, you need to
create an XmlReader that allows dtds as shown below:
XmlReaderSettings schemaReaderSettings = new XmlReaderSettings();
schemaReaderSettings.ProhibitDtd = false;
XmlReader schemaReader = XmlReader.Create("new.xsd", schemaReaderSettings);
try {
XmlSchemaSet set = new XmlSchemaSet();
set.Add(null, schemaReader);
set.Compile();
}
catch(XmlException e) {
Console.WriteLine(e.Message + " at" + e.LineNumber);
}

Thanks,
Priya

<sachi...@gmail.com> wrote in message
news:1146326183.7...@j33g2000cwa.googlegroups.com...

[sachi...@gmail.com]

It Worked. Thanks.
But the system should be connected to internet else it will not be able
to resolve the imports.
Thanks

Sachin