Having written the datetime support for Apache Axis (a
webservice implementation based on XSD schema and having
hosted a number of SOAP interop facilities, I am +1 on the
regular expression limitation, believe that all dates that
that conform to this limitation are valid RFC 3339 and
xsd:dateTime values, and believe that it will interop with
all of the existing XSD implementations.
I'm not sure that I understand why some folks seem to think that this has to
be an either-or situation. As Sam noted, it's quite possible to specify
date-time syntax that conform to both RFC 3339 and XML Schema Part 2.
Here's what I did in RFC 3731:
2.4. Dates and Times
Date and time attribute values MUST be represented in Universal
Coordinated Time (UTC) using the Gregorian calendar. The extended
date-time form using upper case T and Z characters defined in
[RFC3339] MUST be used to represent date-time values as XML Schema
does not support truncated date-time forms or lower case T and Z
characters.
I then used the xsd:dateTime data type in my schema (with an appropriate
reference to Part 2), and all is well. The normative text eliminates some
of the 3339 possibilities that don't work or play well with XML Schema.
-Scott-
