Question mark (?) in search filters

Hello,

I'm configuring an application using my openldap and I'm seeing queries I didn't know them before. The queries are like this:

filter="(|(objectClass=groupOfNames)(?objectClass=container)(objectClass=organization)(objectClass=organizationalUnit)(objectClass=domain)(?objectClass=domaincomponent)(?objectClass=builtinDomain))"

This may be the first time I see the ? in the search filter of a query.

But when I try to reproduce it with ldapsearch command I get:

$ ldapsearch '(|(objectClass=groupOfNames)(?objectClass=container)(objectClass=organization)(objectClass=organizationalUnit)(objectClass=domain)(?objectClass=domaincomponent)(?objectClass=builtinDomain))' # extended LDIF # # LDAPv3 # base <dc=Telematica> (default) with scope subtree # filter: (|(objectClass=groupOfNames)(?objectClass=container)(objectClass=organization)(objectClass=organizationalUnit)(objectClass=domain)(?objectClass=domaincomponent)(?objectClass=builtinDomain)) # requesting: ALL #

ldap_search_ext: Bad search filter (-7)

I guess the problem in the query is because of the '?' operator. So, how can I reproduce it with ldapsearch?

And... what does this '?' mean?

Thanks,

--- Angel L. Mateo Martínez Sección de Telemática Área de Tecnologías de la Información y las Comunicaciones Aplicadas (ATICA) http://www.um.es/atica Tfo: 868889150 Fax: 868888337