[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XML5: Re: MicroXML
On 14/12/2010 01:29, rjelliffe wrote: > Is Henri suggesting (and I don't want to say it is a bad idea...) that > really there already is a subset of XML implemented and in the field: > that subset of XML that HTML5 parsers will support? I think Henri wrote > "XML5" at one stage as a typo, but it fits. "xml5" wasn't a typo, it was a reference to http://code.google.com/p/xml5/ The trouble is that HTML5 parsers will parse a large subset of XML but produce radically different parse trees, leading to silent data corruption. It's virtually impossible for a human to figure out what parse tree an html5 parser will produce from a fragment of well formed XML, you just have to [expletive deleted] it and see. Some random examples 1) <p><a id="foo"/> <b>xx</b></p> parses as <p><a id="foo"> <b>xx</b></a></p><a id="foo"> </a> 2) <p><math><mfrac><mn>1</mn><span>x</span></mfrac></math></p> parses as <p><math><mfrac><mn>1</mn></mfrac></math><span>x</span></p> 3) <p><maths><mfrac><mn>1</mn><span>x</span></mfrac></maths></p> which has the same structure as (2), but a different element name, parses as <p><maths><mfrac><mn>1</mn><span>x</span></mfrac></maths></p> The polyglot spec (which still has its own problems) tries to lead people away from these traps, but documenting that they exist doesn't really help unless all the tools are updated. the costs of that compared to the costs of html specifying a sane parsing mode in standards mode seem to have been discounted. David ________________________________________________________________________ The Numerical Algorithms Group Ltd is a company registered in England and Wales with company number 1249803. The registered office is: Wilkinson House, Jordan Hill Road, Oxford OX2 8DR, United Kingdom. This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. ________________________________________________________________________
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