Validating wsdl file
You can find the Schema Validation filter in the Content Filtering category of filters in the Policy Studio.
Drag and drop the filter on to the policy where you want to perform schema validation.
In this case, they should enter or select an XPath expression that identifies the SOAP Body of the message.
This portion should then be validated against an XML Schema that defines the structure of the SOAP Body for that particular message.
For such element definitions to be validated by a schema, the type declarations must be removed, which is precisely what the Schema Validation filter does if the checkbox is selected on this tab.
It removes the type declarations and then makes a to validate the message.
When these nodes are expanded, the contained XML Schemas are displayed in the tree.
Each schema has an associated checkbox, which you can use to select the schema to validate the incoming message.
A portion of the XML message can be extracted using an XPath expression.
It also specifies the data types of these elements to ensure that only appropriate data is allowed through to the Web Service.