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XML Parsing with C++

XML Parsing can be well done with the Apache Xerces framework. Very well designed .

Depending on the type of application, one can choose between a tree based model called DOM, and a model suitable for very fast proessing - SaX.

Tree based processing with DOM

DOM parses the XML code into a tree. The application can fetch all or part of this tree, retieve data and change the tree. The new tree can be serialised again.

• DOM cannot be used for vey large files, because it keeps the whole XML - tree in memory.
• Since DOM keeps the whole XML structure, the application programmer can write code to traverse through the XML tree, can go up and down as often as necessary.
• The application gets visibility of tree, when DOM has parsed the file completely.

Iterator based processing with SaX

SaX does not parse the XML code at one, but iterates through the stream of XML tags and offers the application programmer an interator to walk through the XML Code. The application can supply patterns to the SaX library on which it wants to operate on or extract further information ( attributes ).

• Sax is very fast. The price is a reduced flexibility.
• Even very large files are no problem.
• Sax does not parse large chunks of the XML code until it hands it over to the application. This makes SaX the right choice for online processing of large amounts of data.

Documentation

Apache constantly work on their framework as well as on the documentation.

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Franz Brandel

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