+ <para>
+ When mapping MARC XML records, XSLT can be bypassed for increased
+ performance with the alternate "MARC map" format. Provide the
+ path of a file with extension ".mmap" containing on each line:
+ <programlisting>
+ <field> <subfield> <metadata element></programlisting>
+ For example:
+ <programlisting>
+ 245 a title
+ 500 $ description
+ 773 * citation</programlisting>
+ To map the field value specify a subfield of '$'. To store a
+ concatenation of all subfields, specify a subfield of '*'.
+ </para>