All - the use of generic data types make it impossible to determine the actual intent of the message and limits validation. An error would change the intent of the message with no way of knowing that an error had occurred

Added conformance guidance to section on specifications that wish to claim conformance. • Business Purpose - Because WS-Calendar is general purpose, it does not distinguish between different exchanges that may have different purposes. For example, a general indication of capability and/or timeliness may be appropriate for a market tender, and an unanchored Sequence may be appropriate. In the same specification, performance execution could require merely the Gluon to Anchor the Interval. If the distinction between Unanchored and Anchored Interval is critical for a set of interactions, the referencing specification SHALL indicate the proper form for a given exchange.