Key SOA Specifications

Java-specific specs
JAX-WS
JAXB
SAAJ
JAXR
Web Services
WS-Annotations
DOM, SAX, StAX

SOAP and WS-* Specs
XML Schema
XSLT
SOAP
WSDL
OASIS UDDI
WS-Policy
BPEL
WS-Security
WS-Trust
WS-ReliableMessaging
WS-Transaction
WS-MetadataExchange

Industry Standards
Basic Profile 1.1
— Use as a jumping off place to define best practices.
OASIS XML Catalog
W3C Web Services Architecture
OASIS Web Services Implementation Methodology

Security
— Use of particular cipher suites
— Use of digital signatures
— Transport layer security
— Authentication methods

Create an aggregate list of roles within each service to help organize process orchestration efforts.

References:
Eben Hewitt. Java SOA Cookbook. O’Reilly: 2009.