Professional IronPython

XML Namespaces (both stream level and Document Object Model, DOM):
http://www.w3.org/TR/REC-xml-names/
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XSD Schemas: 
http://www.w3.org/2001/XMLSchema
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XPath expressions: 
http://www.w3.org/TR/xpath
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XSLT transformations: 
http://www.w3.org/TR/xslt
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DOM Level 1 Core: 
http://www.w3.org/TR/REC-DOM-Level-1/
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DOM Level 2 Core: 
http://www.w3.org/TR/DOM-Level-2/
Developing a Basic .NET XML Application
A .NET XML application will follow most of the same principles you use when working with a 
static language such as C# or Visual Basic.NET. In fact, you might not notice much difference at all 
except for the obvious structural requirements of a Python application. Consequently, you should 
find it easy to move your XML code over to IronPython because you really don’t have anything new 
to worry about. Listing 13-1 shows a simple XML application that creates an XML document, saves 
it to disk, reads it from disk, and then displays the content onscreen.
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Using the .NET XML Functionality
 
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DoM-oNLy SUPPoRT IN THE .NET FRAMEWoRk
It’s important to note that the .NET Framework supports DOM and not Simple API 
for XML (SAX). However, if you want SAX support, you can use the Python modules 
instead (see the “Working with xml.sax” section of this chapter). XML files include 
both data and context. In order to reconstruct the original dataset described by an 
XML file, you need a parser to read the text and then convert it to a usable object. 
DOM and SAX represent two different methods for interacting with XML documents 
without forcing the developer to create a parser. If you want more information about 
the DOM versus SAX approach to parsing XML parsers, check out the information at 
http://developerlife.com/tutorials/?p=28
and 
http://www.jamesh.id.au/
articles/libxml-sax/libxml-sax.html
. Here’s a summary of the DOM features.
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Object-based.
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Object module is created automatically.
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Element sequencing is preserved.
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High memory usage.
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Slow initial data retrieval.
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Best for complex data structures.
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In-memory document updates are supported.
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SAX takes a completely different approach than DOM. Here’s a summary of
the SAX features.
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Event-based.
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Object module is created by the application.
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Element sequencing is ignored in favor of single events.
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Low memory usage.
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Fast initial data retrieval.
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Best for simple data structures.
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No document updates.
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