<ref name="filter_cql_rpn"/>
<ref name="filter_frontend_net"/>
<ref name="filter_http_file"/>
+ <ref name="filter_limit"/>
<ref name="filter_load_balance"/>
<ref name="filter_log"/>
<ref name="filter_multi"/>
<ref name="filter_sru_z3950"/>
<ref name="filter_virt_db"/>
<ref name="filter_z3950_client"/>
- <ref name="filter_limit"/>
</choice>
<!-- | filter_zeerex_explain -->
</element>
<data type="NCName"/>
</attribute>
</optional>
- <oneOrMore>
+ <zeroOrMore>
<element name="mp:database">
<attribute name="name">
<data type="NCName"/>
</attribute>
<ref name="any"/>
</element>
- </oneOrMore>
+ </zeroOrMore>
</define>
<define name="filter_virt_db">
<attribute name="type">