add XMLGregorianCalendar.add(Duration)

[glassfishrobot]

Add a method to javax.xml.datatype.XMLGregorianCalendar that adds a Duration to
XMLGregorianCalendar.

Duration.addTo(java.util.Calendar) and Duration.addTo(java.util.Date) already
provide
a means to add a duration to these object. Add the logical equivalent of adding
duration to XMLGregorianCalendar, XMLGregorianCalendar.addTo(Duration).

Environment

Operating System: All
Platform: All

Affected Versions

[2.0 draft]

[glassfishrobot]

Reported by @jfialli

[glassfishrobot]

Was assigned to kohsuke

[glassfishrobot]

@jfialli said:
Upped priority to address this issue.

[glassfishrobot]

This issue was imported from java.net JIRA JSR222-9