def delete_field(field_uri):
root = T.DeleteItemField(<EOL>T.FieldURI(FieldURI=field_uri)<EOL>)<EOL>return root<EOL>
Helper function to request deletion of a field. This is necessary when you want to overwrite values instead of
appending.

<t:DeleteItemField>
  <t:FieldURI FieldURI="calendar:Resources"/>
</t:DeleteItemField>