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Re:Ruby concepts part 2 (1 viewing) (1) Guest
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TOPIC: Re:Ruby concepts part 2
#4726
ShriNi (User)
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Re:Ruby concepts part 2 3 Years, 10 Months ago Karma: 0  
XML is extremely useful for keeping track of small to medium amounts of data without requiring a SQL-based backbone.
 
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ShriNi (User)
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Re:Ruby concepts part 2 3 Years, 10 Months ago Karma: 0  
There are two different flavors available for XML parsers


SAX-like (Stream interfaces)

Here we register callbacks for events of interest and then let the parser proceed through the document.


This is useful when we documents are large or we have memory limitations, it parses the file as it reads it from disk, and the entire file is never stored in memory
 
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Re:Ruby concepts part 2 3 Years, 10 Months ago Karma: 0  
DOM-like (Object tree interfaces)

This is World Wide Web Consortium recommendation wherein the entire file is read into memory and stored in a hierarchical (tree-based) form to represent all the features of an XML document
 
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#4729
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Re:Ruby concepts part 2 3 Years, 10 Months ago Karma: 0  
SAX can't process information as fast as DOM can when working with large files.

On the other hand, using DOM exclusively can really kill our resources, especially if used on a lot of small files
 
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Re:Ruby concepts part 2 3 Years, 10 Months ago Karma: 0  
SAX is read-only, while DOM allows changes to the XML file.

Since these two different APIs literally complement each other there .
 
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Re:Ruby concepts part 2 3 Years, 10 Months ago Karma: 0  
The most common way to manipulate XML is with the REXML library.

The REXML has been part of the standard Ruby distribution since 2002.
 
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