For those users who are more experienced with the SQL style of querying, Diorama provides an expert query tool based on DIOM-IQL. Expert queries can also be installed and re-issused periodically or fired later by some pre-defined triggers [20]. An expert query may run over a set of interfaces defined through a mediator. The resultant object is represented in terms of an IDL specification derived from the query specification itself.
The DIOM-IQL form shown in
Figure 7 closely follows the DIOM-IQL syntax
description [17].
The Mediator field allows the user to specify which grouping of interfaces to use and
can be left open to allow the system to generate the corresponding IDL
interface.
The Target field specifies
the information repositories to be used or avoided in the query where
repositories to be avoided are preceded by an `!'.
The
Select field allows the user to select only those fields which
are of interest to her. The From field specifies the interfaces
to use. The Where field contains the query conditions to be
matched.
The Outer Join option allows to return a
full outer join of all records relevant to the query.
The results can be grouped and ordered by filling in the
appropriate conditions in the group and order fields
respectively. Expert queries can be traced by using the trace
checkbox.
For example, the query 
given in Figure 3
can be entered as shown in Figure 7.