Filters of the type LDAP_FILTER_AND, LDAP_FILTER_OR , and LDAP_FILTER_NOT generally consist of one or more other filters. For example:
(&(ou=Accounting)(l=Sunnyvale)) (|(ou=Accounting)(l=Sunnyvale)) (!(l=Sunnyvale))
Each of these examples contain one or more LDAP_FILTER_EQUALITY filters.
Call the slapi_filter_join() function to create a new filter of the type LDAP_FILTER_AND, LDAP_FILTER_OR, or LDAP_FILTER_NOT.