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The universality of "single starting point"

• From: "Costello, Roger L." <costello@mitre.org>
• To: "xml-dev@lists.xml.org" <xml-dev@lists.xml.org>
• Date: Sat, 23 Nov 2013 16:50:35 +0000

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?

/Roger

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