DESCRIPTION: send invitation

METHOD: POST

AUTH: true

URL: /ucaldav/user/mtwain/calendar

CONTENTTYPE: text/xml

CONTENT:
<?xml version="1.0" encoding="utf-8" ?>
<CS:share xmlns:D="DAV:" xmlns:CS="http://calendarserver.org/ns/">
    <CS:set>
        <D:href>mailto:douglm@mysite.edu</D:href>
        <CS:summary>Shared Calendar</CS:summary>
        <CS:read-write/>
    </CS:set>
</CS:share>