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format Format

Name of the image format for the bitmap that is provided with a <glyph-data> element. This element is used to define a private use character when the <private-char> contains a bitmap.

Usage/Remarks

If a plain bitmap is included inline, the value of this attribute should be “PBM”, indicating that the plain text bitmap will be a human-readable matrix of zeros and ones.
OPTIONAL on element: <glyph-data>
Value Meaning
A word A word naming the format of the bitmap. The word may not contain any spaces, and the characters of the word are limited to letters, numbers, and these special characters: period, hyphen, underscore, and colon.
Restriction @format is an optional attribute; there is no default.
Tagged Sample

A PBM bitmap format (for a <glyph-data>) 

...
<private-char name="NORTHWEST SOUTHEAST ARROW" description="Arrow,
  normal weight, single line, two-headed, Northwest to Southeast">
 <glyph-data id="NWSEArr" format="PBM" resolution="300"
   x-size="34" y-size="34">
  ...
 </glyph-data>
</private-char>
...