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<glyph-ref> Glyph Reference for a Private Character

Once a private character has been declared using a <glyph-data> element, the character need not be defined with the same <glyph-data> element every time it is used. The character can be reused by using the <glyph-ref> element to point to the full <glyph-data> element. 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. Since the reference uses the ID/IDREF, the reference may precede or follow the element to which it is pointing.
Attributes
glyph-data

Base Attributes

id
xml:base
Models and Context
May be contained in
<private-char>
Description
This is an EMPTY element
Content Model
<!ELEMENT  glyph-ref    EMPTY                                        >
Tagged Sample

Link to <glyph-data> 

...
<p>... The map symbol indicating these conditions will be a
 <private-char name="BentArrow" 
   description="Symbol - right arrow bending up over right arrow bending down">
  <glyph-data id="pc5001" format="PBM" resolution="300" x-size="15" y-size="28">
   000000000001000
   000000000011100
   000000000111110
   000000001111111
   000000000001000
   000000000001000
   000000000001000
   000000000001000
   000000000001000
   000000000001000
   000000000001000
   000000000001000
   111111111110000
   000000000000000
   000000000000000
   111111111110000
   000000000001000
   000000000001000
   000000000001000
   000000000001000
   000000000001000
   000000000001000
   000000000001000
   000000000001000
   000000001111111
   000000000111110
   000000000011100
   000000000001000</glyph-data>
 </private-char>. The NOAA 1993 standard definition of
 <private-char name="BentArrow" 
   description="Symbol - right arrow bending up over right arrow bending down">
  <glyph-ref glyph-data="pc5001"/>
 </private-char> will apply.</p>
...