RE: Starting To Use Xerces

You don't necessarily have to use the same method for reading documents
that you use for generating them.  SAX is a great interface for building
up data structures from a document.  It's fast, flexible, and efficient.
DOM parsing also has its uses, of course, but it tends to be more
cumbersome, and uses much more memory.  DOM shines in document creation,
however.  So I tend to use SAX for parsing and DOM for generating
documents, and I suspect that I'm in good company.  It makes a lot of
sense when you're using XML to represent data that already has an
in-memory representation, that is, when XML is just a serialization
format for your data.

Nonetheless, it sounds like the DOM does what you need.

You might want to look at the sample apps (DOMPrint, for instance) to
get a sense of how to use the DOM APIs.  Also consider XML data binding
tools such as Code Synthesis XSD
(http://codesynthesis.com/products/xsd/), which is based on Xerces.

-----Original Message-----
From: appleGuy [mailto:alx.curtis@xxxxxxxxx] 
Sent: Friday, December 15, 2006 8:29 AM
To: c-users@xxxxxxxxxxxxxxxxx
Subject: Re: Starting To Use Xerces


Hi,

Ok I made the changes to the XML file.
I think im going to use Dom, i read that it allows saving & creating XML
files. I need to use this eventually & because I have a short timeframe
I
just want to get used to one method. IIs this Ok, will Dom Fufil my
needs?

Also How would I start to impliment the Dom (for reading files)... dont
see
a constructor anywhere in the docs...Is it createDOMBuilder ??

Cheers
Alex


Alberto Massari wrote:
> 
> At 16.15 14/12/2006 -0800, appleGuy wrote:
> 
>>Hi,
>>
>>This could be quite a long thread, so please bear with me.
>>Ok ive got Xerces installed & its compiling the example correctly.
>>
>>Now im totally new to XML let alone this parser. Ive contructed the
>>following xml file. I need the file to contain data that can be parsed
&
>>values loaded into predefined variables within my application..
Firstly I
>>suppose I need to know if my XML file is ok: (the example uses place
holders
>>so author in a real file would be a persons name)
>>
>><?xml version="1.0" encoding="ISO-8859-1"?>
>><loopcardprj>
>>         <_prjsetup>
>>                 <title>untitled</title>
>>                 <author>author</author>
>>                 <subject>subject</subject>
>>                 <card>subject</card>
>>         </_prjsetup>
>>         <_questions>"What Is 5 x 3?","What Is 5 x 5?","What Is 5 x 
>> 5?"</_questions>
>>         <_answers>"15","25","10"</_answers>
>>         <_comment>This is an example of a file layout for the 
>> LoopCard Software By
>>Alex Curtis</_comment>
>></loopcardprj>
> 
> The XML is well-formed; but I would rather use this structure, in 
> order to avoid complex application logic to associate a question with 
> its answer:
> 
>          <_questions>
>                  <question>
>                          <q>What Is 5 x 3?</q>
>                           15 
>                  </question>
>                  <question>
>                          <q>What Is 5 x 5?</q>
>                           25 
>                  </question>
>                  <question>
>                          <q>What Is 5 + 5?</q>
>                           10 
>                  </question>
>          </_questions>
> 
>>(IF OK): I need to know how to use the parser to parse this file &
dump
the
>>data into the correct variables. I read that DOMBuilder was the class
to
>>use???
> 
> DOMBuilder will build a DOM tree that you will have to navigate 
> (DOMDocument->getDocumentElement() will give you the pointer to the 
> "loopcardprj" node; from there, getFirstChild()/getNextSibling() will 
> give you either text nodes containing whitespace or the 
> "_prjsetup"/"_questions" element; and so on.. until you will find 
> some text nodes containing the real data).
> Alternatively you can use a SAXParser or a SAX2XMLReader that will 
> convert the file into a sequence of callbacks (start "loopcardprj" 
> element; start "_prjsetup" element; start "title" element; found data 
> "untitled"; end "title" element...); if you just need to convert the 
> XML file into a C++ data structure, this would be the choice I would
made.
> 
> Alberto
> 
> 
>>Please If you could help, im really new to this XML / Parsing
Business...
>>
>>
>>Many Thanks
>>-Alex
>>--
>>View this message in context: 
>>http://www.nabble.com/Starting-To-Use-Xerces-tf2824403.html#a7884089
>>Sent from the Xerces - C - Users mailing list archive at Nabble.com.
> 
> 
> 

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