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glyph-data Glyph Data Character Being Referenced

An IDREF-type attribute that points to the @id attribute of the <glyph-data> character inside a <private-char> element. The idea is to use the full <glyph-data> with its name and bitmap once, then point to an existing character instead of defining the entire <glyph-data> element repeatedly.

Usage/Remarks

Once a private character has been declared using a <glyph-data> element, the character can be reused by using this attribute on a <glyph-ref> element to point to the existing full <glyph-data> element (bitmap included).
OPTIONAL on element: <glyph-ref>
Value Meaning
An identifier (IDREF) The pointing uses the ID/IDREF mechanism, using the @glyph-data attribute of the <glyph-ref> element to point to the @id attribute of an existing <glyph-data> element.
Restriction @glyph-data is an optional attribute; there is no default.
Tagged Sample

Using @glyph-data to reference an existing bitmap (<private-char>) 

...  
<private-char name="NORTHWEST SOUTHEAST ARROW" description="Arrow,
  normal weight, single line, two-headed, Northwest to Southeast">
 <glyph-ref glyph-data="NWSEArr"/></private-char>
...