Provide totally ordered duration types, specifically one that is
expressed only in years and months, and one that is expressed only in
days, hours, minutes, and seconds (ignoring leap seconds.) Possibly
define other totally ordered duration types such as day/hour/minute
and hour/minute/second duration.

Input from Straw Poll O-5

This item was discussed in the meeting of 2003-09-17
(http://www.w3.org/XML/Group/2003/09/xml-schema-ftf-minutes.html)

This item was mentioned in the meeting of 2003-09-18
(http://www.w3.org/XML/Group/2003/09/xml-schema-ftf-minutes.html)

This item was discussed in the meeting of 2003-10-03
(http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2003Oct/0018.html)

This item was discussed (and phase-1 agreement reached) in the meeting
of 2003-10-09
(http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2003Oct/0038.html)

This item was discussed in the meeting of 2003-10-10
(http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2003Oct/0042.html).
The draft wording was returned to the editors for revision.

This item was discussed in the meeting of 2003-11-03
(http://www.w3.org/XML/Group/2003/11/xml-schema-ftf-minutes.html)

This item was discussed in the meeting of 2003-12-04
(http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2003Dec/0005.html);
the editors submitted revised text that day.

This item was discussed and phase 2 wording was considered, amended,
and approved in the meeting of 2003-12-18
(http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2003Dec/0060.html).

This item was discussed in the meeting of 2004-01-09
(http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2004Jan/0021.html).

This item was discussed in the meeting of 2004-06-11
(http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2004Jun/0121.html).

Proposal:
yearMonthDuration and dayTimeDuration as defined in
XQuery and XPath Function and Operators (http://www.w3.org/TR/xquery-operators/)

This requirement has been satisfied by the inclusion of the types
in question in the Datatypes spec.

In January 2006, the XML Query and XSL Working Groups agreed to use
names in the XML Schema namespace for these types; our definitions and
theirs must agree in all details.