returns xml fragment.
<response success="true" error="">
if success attribute is "true", the results have been received succesfully like the xml sample below.
if success attribute is "false", the error attribute indicates the encountered error.
<response success="true" error="">
<PropertySets>
<PropertySet Name="LETTER" Caption="Letter" AppliesToDocuments="TRUE" AppliesToFolders="TRUE" AppliesToUsers="FALSE" SystemUseOnly="FALSE">
<DomainRestrictions Global="TRUE" />
</PropertySet>
</PropertySets>
</response>