Add request validation against xsd

Change-Id: Iadf618e50d01dd92bf9eed5b8ed98138b56c20c9

mockserver-tests/src/test/resources/schema1.xsd

@@ -0,0 +1,19 @@
+<xs:schema elementFormDefault="qualified"
+           version="1.0"
+           targetNamespace="http://mockserver/test1"
+           xmlns:tns="http://mockserver/test1"
+           xmlns:xs="http://www.w3.org/2001/XMLSchema"
+           xmlns:test2="http://mockserver/test2">
+
+    <xs:import namespace="http://mockserver/test2" schemaLocation="schema2.xsd"/>
+
+    <xs:element name="request" type="tns:Request"/>
+
+    <xs:complexType name="Request">
+        <xs:sequence>
+            <xs:element name="id" type="xs:int"/>
+            <xs:element name="value" type="test2:Value"/>
+        </xs:sequence>
+    </xs:complexType>
+</xs:schema>
+