<entry><literal>?</literal></entry>
</row>
<row>
+ <entry>mask</entry>
+ <entry>Masking character. Requires YAZ 4.2.58 or later</entry>
+ <entry><literal>#</literal></entry>
+ </row>
+ <row>
<entry>field</entry>
<entry>Specifies how multiple fields are to be
combined. There are two modes: <literal>or</literal>: