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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Re: Where does the "nothing left but toolkits" mythcome fr
 On Mon, 2005-02-07 at 06:37 -0500, Elliotte Harold wrote: > Kurt Cagle wrote: > > > > used for denoting that section. I should also point out that CDATA > > sections become almost necessary when dealing with "unsafe" content - > > XML wrappers holding blog feedbacks written by people who don't have > > the first clue about why ampersands in text are bad for your > > application > > I would say rather that CDATA sections are dangerously close to solving > the problem of wrapping unsafe content; close enough that they convince > people to use them without actually solving the problem. Three issues: > > 1. They cannot contain ]]>. Therefore the text must be scanned anyway to > be safe. > > 2. They cannot contain characters from outside the current character set > (though this is not really a problem if the document is written in UTF-8 > or another Unicode encoding). > > 3. They cannot contain most C0 control characters. > > Consequently, you can't just take a random chunk of text and throw it in > a CDATA section. You might as well as use numeric character references > for this use case, and you'd be less likely to have problems if you did. I know most people on this list know this, but because the above is a good reference post, I wanted to clarify that using numerical characters references does not solve #3. I've always been of two minds about the fact that XML makes representing some Unicode characters impossible without heavyweight encoding methods such as base64. Being one of the text gang (as opposed to the data gang), I understand the motivations here, but I also think that if XML provided some consideration to cover all Unicode characters, it would make life easier for everyone. -- Uche Ogbuji Fourthought, Inc. http://uche.ogbuji.net http://4Suite.org http://fourthought.com Use CSS to display XML - http://www.ibm.com/developerworks/edu/x-dw-x-xmlcss-i.html Introducing the Amara XML Toolkit - http://www.xml.com/pub/a/2005/01/19/amara.html Be humble, not imperial (in design) - http://www.adtmag.com/article.asp?id=10286 Querying WordNet as XML - http://www.ibm.com/developerworks/xml/library/x-think29.html Manage XML collections with XAPI - http://www-106.ibm.com/developerworks/xml/library/x-xapi.html Default and error handling in XSLT lookup tables - http://www.ibm.com/developerworks/xml/library/x-tiplook.html Packaging XSLT lookup tables as EXSLT functions - http://www.ibm.com/developerworks/xml/library/x-tiplook2.html 
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