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Re: Q. about 'DOM-Hash-total'

• To: "Scherpenzeel, Wim" <Wim.Scherpenzeel@s...>
• Subject: Re: Q. about 'DOM-Hash-total'
• From: Ronald Bourret <rpbourret@r...>
• Date: Thu, 03 Jan 2002 09:51:09 -0800
• Cc: "'xml-dev@l...'" <xml-dev@l...>
• References: <6B2492D663ECD4119EB70008C7E6F67301DF17E9@s...>

"Scherpenzeel, Wim" wrote:

> Now as I understood, whitespace is insignificant, provided there is DTD to
> specify to the Parser that there aren't any mixed content elements.
> 
> Yet the following two documents yield different hash-totals, can anybody
> explain why?
> 
> Document 1:
> 
> <!DOCTYPE foo SYSTEM "E:\My Documents\xml\voorbeelden\DOMHash\foobar.dtd">
> <foo>
>         <bar>blablabla</bar>
> </foo>
> 
> Document 2:
> 
> <!DOCTYPE foo SYSTEM "E:\My Documents\xml\voorbeelden\DOMHash\foobar.dtd">
> <foo><bar>blablabla</bar></foo>
> 
> DTD:
> 
> <!ELEMENT foo (bar)>
> <!ELEMENT bar (#PCDATA)>

According to the XML specification, all white space is significant --
that is, the processor (parser) must pass it to the application and let
the application decide what to do with it.

"Insignificant whitespace" is a concept introduced by SAX 1.0 for the
situation you described -- whitespace that appears between child
elements in an element known to have element content. While this makes
it easier for applications to process such whitespace, notice two
things: (1) the whitespace is still passed to the application, and (2)
SAX 1.0 is outside the XML 1.0 spec. It is therefore reasonable that
your documents yield different hash totals.

-- Ron

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