Enlaces externos
- Web Services Description Language (WSDL) 1.1 (https://www.w3.org/TR/wsdl/)
- Simple Object Access Protocol (SOAP) 1.1 (https://www.w3.org/TR/soap11/)
- W3C XML Schema Definition Language (XSD) 1.1 Part 2: Datatypes (https://www.w3.org/TR/xmlschema11-2/)