[DFDL-WG] Clarification when calendarPattern is a superset of the type

[Steve Lawrence]

Assume we have the following element:

<xs:element name='date' type='xs:date' dfdl:calendarPattern='yyyy-MM-dd 
hh:mm' />

So we have a element of type xs:date, but a calendarPattern that 
specifies date and time formatting symbols. What should happen in this 
case? Two potential options that I see (there are probably others):

1) Throw some kind of error, signifying that calendarPattern contains 
formatting symbols not allowed for the type.

2) Truncate the parsed data to fit the type, so the data

   2013-01-22 11:59

becomes

   <date>2013-01-22</date>

This seems reasonable, however the spec mentions the following:

   When unparsing, and property calendarPattern contains a formatting
   symbol that requires a component of the date/time and the infoset
   value does not contain that component, it is a processing error.

So that means it is impossible to unparse when the calendar pattern is a 
superset of the element type. Is this ok?

Thoughts?

- Steve