Re: XML Parsing

Vassilis Kostakos wrote:


> A few questions on XML:
>
> - Where can I find an XML parser that I can use in my PC (Win/Linux)
> - I'm supposed to be working on a parser for XML. I was wondering if I
> could have something such as:
>
> <num>3</num> <op>plus</op> <num>5</num> <op>equal</op>
>
> which would yield as output <num>8</num>


1) You can get a quite satisfactory open source XML parser from
www.apache.org, in either C++ or Java. A Java XML parser is also
available directly from java.sun.com, and you can find pointers to
several more parsers by following links from www.w3.org or
www.xml.org.


2) Not exactly, because it is an XML rule that all valid XML documents
have a single top-level element, and you have four. But something
very similar would be quite easy:


<calculate op="plus">
  <num>3</num>
  <num>5</num>
</calulate>


with a DTD that looks something like:


<!ELEMENT calculate ((num|calculate),(num|calculate))>
<!ELEMENT num (#PCDATA)>
<!ATTLIST calculate op (plus|minus|times|divide) #REQUIRED>


I'm writing that DTD from memory, so if I gribbled the syntax a bit
you'll have to fix it.

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