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RE: The universality of "single starting point"

XML doesnt always start with the root element.


[1]   	document	   ::=   	 prolog element Misc*

It starts with an *optional* prolog.

David A. Lee

-----Original Message-----
From: Costello, Roger L. [mailto:costello@mitre.org] 
Sent: Saturday, November 23, 2013 11:51 AM
To: xml-dev@lists.xml.org
Subject: [xml-dev] The universality of "single starting point"

Hi Folks,

1. Formal grammars require that a single symbol be the starting point for all productions. For example, the starting symbol is S in this grammar:

	S -> a Q a
	Q -> ...

2. Structured programming tells us that every function should have a single entry point.

3. XML has a single starting point - the root element

Wow! I see this concept of a single starting point everywhere I look. Above I have provided three occurrences. Would you provide other occurrences please?



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