Messaging Specifications
SOAP
WS-Addressing
MTOM (Attachments)
WS-Enumeration
WS-Eventing
WS-Transfer
SOAP-over-UDP

Security Specifications
WS-Security: SOAP Message Security
WS-Security: UsernameToken Profile
WS-Security: X.509 Certificate Token Profile
WS-SecureConversation
WS-SecurityPolicy
WS-Trust
WS-Federation
WS-Federation Active Requestor Profile
WS-Federation Passive Requestor Profile
WS-Security: Kerberos Binding
Web Single Sign-On Interoperability Profile
Web Single Sign-On Metadata Exchange Protocol

Reliable Messaging Specifications
WS-ReliableMessaging

Transaction Specifications
WS-Coordination
WS-AtomicTransaction
WS-BusinessActivity

Metadata Specifications
WSDL
WS-Policy
WS-PolicyAssertions
WS-PolicyAttachment
WS-Discovery
WS-MetadataExchange

XML Specifications
XML
Namespaces in XML
XML Information Set

Management Specifications
WS-Management
WS-Management Catalog

Business Process Specifications
BPEL4WS

Specification Profiles
Devices Profile
WS-I Basic Profile