This attribute points to a tag list of attribute mappings which the
icclass object uses to change the attribute IDs of an OM_UPDATE's
attribute/value pairs.  For example, if an icclass object had the
following ICA_MAP:

    struct TagItem map[] =
    {
        {PGA_Top, STRINGA_LongVal},
        {MYATTR, MYNEWATTR},
        {TAG_END, }
    };

before sending an OM_UPDATE to its ICA_TARGET, the icclass object scans
through the OM_UPDATE message's attribute/value pairs looking for the
PGA_Top and MYATTR attributes.  If it finds the PGA_Top attribute, it
changes PGA_Top to STRINGA_LongVal.  Likewise, if the icclass object finds
the MYATTR attribute, it changes MYATTR to MYNEWATTR.  The icclass object
does not disturb the attribute's value.

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