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So, if XML disallows certain symbols, but each Turing machine has it's own alphabet, just because XML doesn't allow 0x0000 doesn't mean that an XSLT stylesheet can't be a UTM, just that it has a different alphabet from another UTM. In fact, the other page - http://www.unidex.com/turing/utm.htm - states that: The Universal Turing Machine stylesheet runs the Turing machine that is SPECIFIED BY THE SOURCE DOCUMENT. Not some pie in the sky non-XML compliant other source document. A Turing Machine has its own set of rules that it has to follow to get to where it's going. ------- Jerry -----Original Message----- From: Kenneth Stephen [mailto:marvin.the.cynical.robot@xxxxxxxxx] Sent: Friday, August 27, 2004 12:36 PM To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx Subject: [xsl] [slightly OT]Universal Turing machine in XSLT Hi, Found this on the web : http://www.unidex.com/turing/utm.htm It seems to me that one of the implicit assumptions used by a UTM is that it is able to write any specified symbol. If I read the XML spec correctly though, certain symbols are not legal (for example 0x0000 is not a valid Unicode codepoint). That being the case, can this UTM really be valid? Thanks, Kenneth
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