returns xml fragment.
<response success="true" error="">
if success = "true", the function returns the <rules> subnode.
if success = "false", the error attribute returns the error description.
<response success="true" error="">
<Rules>
<Rule Name="AllowableFileTypes" Value="DOC,XLS,BMP" />
<Rule Name="Checkins" Value="allows" />
<Rule Name="Checkouts" Value="allows" />
<Rule Name="DocumentDeletes" Value="allows" />
<Rule Name="FolderDeletes" Value="allows" />
<Rule Name="NewDocuments" Value="allows" />
<Rule Name="NewFolders" Value="allows" />
<Rule Name="ClassifiedDocuments" Value="disallows" />
</Rules>
</response>