From: BA <lists@...>
Date: 2005-06-24T10:59:44+09:00
Subject: Re: REXML libraries and parsing issues

Yes, I want to extract the PDAT element, however, I want to use the 
B110 tag to find this element.  The XML *is* predictable, however, 
there are variations in the placement of the elements (there could be 
several different address fields and/or many paragraphs that need to be 
parsed/searched).  The files are *extremely* large (some could be as 
large as 1-2GB).  I would prefer to do all of the processing in Ruby if 
this is possible (want to use the OO functionality for the text 
processing I want to do) and would like to also incorporate regex if 
possible (started doing this by parsing the file line by line, however, 
ran into malformed XML where I decided that I needed to use the 
database functionality of XML.  Not sure if DOM would work.  Could not 
get XPath to work.  The listener was, quite frankly, a SWAG.  Thanks.

On Jun 23, 2005, at 7:50 PM, James Britt wrote:

> BA wrote:
>> First off, let me say right up front that I am a newbie wrt Ruby.
>> I am trying to parse an XML file, however, am having all kinds of 
>> trouble.  I am using the REXML libraries and the sax2parser/listener. 
>>  In the sax2listener, I can use the character/text part of the 
>> method, however, I cannot for the life of me figure out how to parse 
>> out JUST WHAT I WANT.  Here is what the file looks like as follows:
>> <B110><DNUM><PDAT> this is the text I need </PDAT></DNUM></B110>
>> If I use :character, %w{PDAT} {|text| puts text} ... I get the text 
>> "this is the text I need" printed out.  If I use the B110 or any 
>> combination, I cannot get it to work.  Anyone know how to get the 
>> sax2parser/listener to parse the file and allow me to be selective 
>> about what I parse out of the file?  Thanks for any/all help in this 
>> endeavor!!!!!!!!!!
>
> What, exactly, do you want?  To extract the text from the PDAT element?
>
> How predictable is the XML?
>
> Are the files as small as your example?
>
> Are regular expressions an option?  Or using a DOM and XPath?
>
> How did you decide to use the listner?
>
> James
>
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