For 2021 - online Python 3 training - see ((here)).
Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.
Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
XML handling in Python - SAX, DOM and XSLT examples
XML is the "eXtensible Markup Language" ... a set of rules to which a language must adhere, rather than a complete language definition - you need to add other elements such as a DTD or Schema to complete the definition of a language that conforms to an XML standard.
How do you process XML, then?
There are three common ways.
a) You can use a SAX parser. SAX is the Simple API for XML. With a SAX parser, you pass the data through a handler which extracts pertinent information as it's passed through - so this is ideally suited to extracting a few very specific bits of information from what is potentially a huge data flow.
b) You can use DOM (the Domain Object Model). Here, you read data into a structure in memory and can process it within that structure. Because XML tags can be nested, you'll end up with nested structures in memory, with the result that you'll probably find yourself writing recursive code
c) XSLT - X Stylesheet Language Transforms - are a way of defining how a file of XSLT is transformed into some other format. XSLT is a programming language itself.
Can we use SAX, DOM, or XSLT in Python?
Yes - you can use any of them. There are many classes supplied with Python, and others which are easy to download. I've uploaded some recent demonstrations - firstly, there's some XML that I've used [here]
... with sample processing of that in Python via SAX [here]
and in Python via DOM [here]
There's an example (using different data) with XSLT [here]
- and you'll note that the XSLT example is much shorter. That's because a lot of the work has been transferred to the XSLT code (see [here]
). The XML for that last example is also available - [here]
. (written 2010-12-09, updated 2010-12-10)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesY151 - Python & XML 
Handling XML in Perl - introduction and early examples - (2009-08-27) 
Good example of recursion in Python - analyse an RSS feed - (2009-11-18) 
Bookkeeping - (2009-12-29) 
XML handling in Python - a new teaching example using etree - (2015-12-09) 
Searching a Json or XML structure for a specific key / value pair in Python - (2016-10-30)
Some other Articles
Sizers (geometry control) in a wxPython GUI - a first exampleObject Oriented Programming for Structured Programmers - conversion trainingCan you trust the big brand names? Python - fresh examples from recent coursesXML handling in Python - SAX, DOM and XSLT exampleswxPython - simple example to add GUI to a server log file analysisSanta Special - rather more special than usual - December 2010TransWilts Rail News ... Melksham (Santa Special) Edition ... 5th December 2010Royal Wedding. How William and Catherine have changed our schedulePerl 6 - significantly nearer, and Rakudo looks very good
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