</para>
<para>
If attribute <literal>backendelementset</literal> is given, that holds
- elementset to be transmitted to backend. If
- <literal>backendelementset</literal> is omitted, the element
+ elementset to be transmitted to backend. An empty value of
+ <literal>backendelementset</literal> has the effect of omitting
+ any Comp-Spec (and elementset) sent to backend.
+ </para>
+ <para>If <literal>backendelementset</literal> is omitted, the element
set from client is used, except if <literal>marcxml</literal> is used.
- If no <literal>backendelementset</literal> is given and
- <literal>marcxml</literal> is used, the elementset is omitted in
- request to backend.
+ In that case (using <literal>marcxml</literal>), no Comp-Spec and no
+ elementset is sent to backend.
</para>
<para>
If attribute <literal>stylesheet</literal> is given, the proxy