Previously one had to set the 'ERROR' attribute. Accept raw also.
So, for example one can say:
<cmap raw="1">
<!-- Hand-coded format13 table mapping all Unicode
characters to .notdef glyph. -->
<hexdata>
0000 0001 <!-- version numTables -->
0000 0006 <!-- platformID encodingID -->
0000000C <!-- offset -->
000D 0000 <!-- format reserved -->
0000001C <!-- length -->
00000000 <!-- language -->
00000001 <!-- nGroups -->
00000001 <!-- startCharCode -->
0010FFFE <!-- endCharCode -->
00000001 <!-- glyphID -->
</hexdata>
</cmap>