PITarget uniqueness

John Cowan cowan at locke.ccil.org
Fri Apr 9 20:16:48 BST 1999

Peter Stark wrote:

> How do I guarantee that the target name of my Processing Instructions (PI)
> are unique? It's probably out of the scope of the XML spec. to specify, but
> are there any general guidelines for naming PIs?

Yes.  The XML Rec specifically allows you to create NOTATION declarations
that map the targets of PIs to URIs or FPIs, thus:

	<DOCTYPE whatever [
	<?myapp do something?>

Then your application can match not on the name, which can be
different in different documents, but on the consistent and unique URI.

John Cowan	http://www.ccil.org/~cowan		cowan at ccil.org
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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