returns xml fragment.
<response success="true" error="">
if success attribute is "true", the document versions has been returned successfully like the sample below.
if success attribute is "false", the error attribute indicates the encountered error.
<response success="true" error="">
<Versions>
<Version Number="1000001">
<Publisher>System Administrator</Publisher>
<VersionSize>88576</VersionSize>
<CheckSum>970A094B</CheckSum>
<DatePublished>2007-08-08 07:53:42</DatePublished>
<Comment>
</Comment>
</Version>
<Version Number="1000000">
<Publisher>System Administrator</Publisher>
<VersionSize>94720</VersionSize>
<CheckSum>EA4136FC</CheckSum>
<DatePublished>2007-08-08 07:49:32</DatePublished>
<Comment>
</Comment>
</Version>
</Versions>
</response>