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3.3.1 Referring to text

You can make an entity a shorthand for a piece of text which might either need to be parameterised, or which it is simply inconvenient to repeatedly retype.

For example: 

<!DOCTYPE sun PUBLIC "-//Starlink//DTD Starlink SUN//EN" [
  <!ENTITY urlroot "http://www.astro.gla.ac.uk/users/norman">
]>
[...]
<p>Here is a <webref url="&urlroot;/star/" >web page</webref>
When the document is parsed, the text for the entity urlroot is substituted for the entity reference &urlroot;.

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The Starlink SGML Set
Starlink System Note 70
Norman Gray, Mark Taylor
21 April 1999. Release DR-0.7-13. Last updated 24 August 2001