[libxml2]Add libxml2 library

libxml2/test/schemas/cos-ct-extends-1-3_0.xsd

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="ISO-8859-1" ?>
+<!--
+	Schema Component Constraint: Derivation Valid (Extension)
+
+	1.3 If it has an {attribute wildcard}, the complex type definition must 
+	also have one, and the base type definition's {attribute wildcard}'s 
+	{namespace constraint} must be a subset of the complex type definition's 
+	{attribute wildcard}'s {namespace constraint}, as defined by Wildcard Subset (§3.10.6).
+-->
+<schema xmlns="http://www.w3.org/2001/XMLSchema" 	
+	targetNamespace="http://FOO" 
+	xmlns:foo="http://FOO"
+	elementFormDefault="qualified">
+	
+	<element name="foo">
+		<complexType>
+			<sequence>
+				<element name="bar.A" type="foo:type.A" />
+				<element name="bar.B" type="foo:type.B" />
+			</sequence>
+		</complexType>    
+	</element>  
+
+	<complexType name="type.A">
+		<complexContent>
+			<!-- This is OK, since the complete wildcard
+			  is the wildcard of the base type. -->
+			<extension base="foo:base.type.A" />				  	  						
+		</complexContent>
+	</complexType>    
+
+	<complexType name="base.type.A">
+		<anyAttribute namespace="##any" processContents="skip" />		
+	</complexType>    
+
+	<complexType name="type.B">
+		<complexContent>
+			<extension base="foo:base.type.B">	
+				<!-- This is OK, since the complete wildcard is a union
+				  of "##any" and "http://FOO" = "##any". Thus the complete
+				  wildcard is equal to that one in the base class. -->
+				<anyAttribute namespace="http://FOO" processContents="skip" />
+			</extension>
+		</complexContent>
+	</complexType>    
+
+	<complexType name="base.type.B">
+		<anyAttribute namespace="##any" processContents="skip" />		
+	</complexType>    
+
+</schema>