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Windows Communication Foundation (WCF) supports the metadata formats in the following table.
| Protocol | Specification and usage |
|---|---|
| WSDL 1.1 | Web Services Description Language (WSDL) 1.1 WCF uses Web Services Description Language (WSDL) to describe services. |
| XML Schema | XML Schema Part 2: Datatypes Second Edition and XML Schema Part 1: Structures Second Edition WCF uses the XML Schema to describe data types used in messages. |
| WS Policy | Web Services Policy 1.2 - Framework (WS-Policy) Web Services Policy 1.5 - Framework WCF uses the WS-Policy 1.2 or 1.5 specifications with domain-specific assertions to describe service requirements and capabilities. |
| WS Policy Attachments | Web Services Policy 1.2 - Attachment (WS-PolicyAttachment) WCF implements WS-Policy Attachments to attach policy expressions at various scopes in WSDL. |
| WS Metadata Exchange | Web Services Metadata Exchange (WS-MetadataExchange) version 1.1 WCF implements WS-MetadataExchange to retrieve XML Schema, WSDL, and WS-Policy. |
| WS Addressing Binding for WSDL | Web Services Addressing 1.0 - WSDL Binding WCF implements WS-Addressing Binding for WSDL to attach addressing information in WSDL. |