catalog. Other applications take a DLE specification which indicates a set
of DLEs to be operated on. These formats are described below.</para>
+<para>An expression can be disabled be preceding it with the '=' character,
+in that case, an exact match is used.</para>
+<para>Many program have an '--exact-match' argument that disable expression and exact match are used.</para>
</refsect1>
<refsect1><title>HOST & DISK EXPRESSIONS</title>