OpenTravel™ Alliance Best Practices

This document defines the OpenTravel Alliance’s Best Practices Guidelines for all of OTA’s XML data assets. OTA approved message specifications released prior to version base 2001C may not follow the guidelines defined in this document. However, the approval of any OTA specification to be released with version 2001C (or beyond) will be based on how well it complies with OTA’s Best Practice Guidelines.

http://www.opentravel.org/downloads/OTA-BestPractices.PDF