xml-motor what, why & how about the new technique xml-parser rubygem http://justfewtuts.blogspot.com/2012/03/xml-motor-what-it-is-how-why-should-you.html

1. xml­motor
What it is : slide#2
Why you should use it : slide#3-6
How to use it : slide#7-12
AbhishekKr
http://www.twitter.com/aBionic
http://github.com/abhishekkr

2. Late 2011, started a new rubygem project for parsing xml, html.
@Rubygems: http://rubygems.org/gems/xml-motor
@GitHub : https://github.com/abhishekkr/rubygem_xml_motor
Just created it to test out my work at compact, quick &
easy xml­parsing algorithm... can see that
@Slideshare: http://www.slideshare.net/AbhishekKr/xmlmotor
So, currently this is a non­native, completely independent
less­than­250 ruby­LOC available as a simple rubygem to
be require­d and use in an easy freehand notation (like
'div.img') and match with any/multiple node attributes (like
'id=”a1”' or ['type=”color”', 'name=”white”']).

3. Current Features
● Has a single method access to parse require xml nodes from
content or file.
● Use it only if you are gonna parse that xml­content once.
● For using same xml­content more than once, follow the 3­way
step mentioned in examples on end slides.
● It doesn't depend on presence of any other system library,
purely non­native.
● It parses broken or corrupted xml/html content correctly, just
for the content it have.
● Can parse results on looking for node­names, attributes of
node or both.

4. Uses free­freehand notation to retrieve xml nodes.
If your xml looks like,
'<library>...
<book> <title>ABC</title> <author>CBA</author> </book>...
<book> <title>XYZ</title>
<authors>
<author>XY</author><author>YZ</author>
</authors>
</book>...
</library>'
and you look for 'book.author',
then, you'll get back ['CBA', 'XY', 'YZ'];
What that means is the child­node could be at any
depth in the parent­node.
Default return mode is without the tags, there is a
switch to get the nodes.

5. To filter your nodes on the basis of attributes,
single or multiple attributes can be provided.
These attribute searches can be combined up
with freehand node name searches.
Readme (a bit weird, have to loosen it up):
https://raw.github.com/abhishekkr/rubygem_xm
l_motor/master/README

6. Features To Come
Work on making it more performance efficient.
Limit over result­nodes retrieved from start/end of
matching nodes.
Multi­node attribute­based filter for a hierarchical
node search.
Add more common CSS Selector style, capability is
already present using attribute based search... just
need to add a mapping method.

7. USAGE
code we are going to try:
https://github.com/abhishekkr/axml-motor/tree/master/ruby/examples

8. say, you have an xml file 'dummy.xml', with data as
<dummy>
<ummy>
<mmy class='sys'>non-native</mmy>
</ummy>
<ummy>
<mmy class='sys'>
<my class='sys' id='mem'>compact</my>
</mmy>
</ummy>
<mmy type='user'>
<my class='usage'>easy</my>
</mmy>
</dummy>

9. its available at rubygems.org, install it as
$ gem install xml­motor
include it in your ruby code,
#!/usr/bin/env ruby
require 'xml­motor'
get the XML Filename and/or XML data
available
fyl = File.join(File.expand_path
(File.dirname __FILE__),'dummy.xml')
xml = File.open(fyl,'r'){|fr| fr.read }

10. One-time XML-Parsing directly from file
XMLMotor.get_node_from_file
(fyl, 'ummy.mmy', 'class="sys"')
Result:
["non­native", "n <my class="sys"
id="mem">compact</my>n "]
One-time XML-Parsing directly from content
XMLMotor.get_node_from_content
(xml, 'dummy.my', 'class="usage"')
Result:
["easy"]

11. Way to go for XML-Parsing for xml node searches
xsplit = XMLMotor.splitter xml
xtags = XMLMotor.indexify xsplit
[] just normal node name based freehand notation
to search:
XMLMotor.xmldata
(xsplit, xtags, 'dummy.my')
Result: ["compact", "easy"]
[] searching for values of required nodes filtered
by attribute:
XMLMotor.xmldata
(xsplit, xtags, nil, 'class="usage"')
Result: ["easy"]

12. [] searching for values of required nodes filtered by
freehand tag-name notation & attribute:
XMLMotor.xmldata(xsplit, xtags,
'dummy.my', 'class="usage"')
Result: ["easy"]
[] searching for values of required nodes filtered by
freehand tag-name notation & multiple attributes:
XMLMotor.xmldata(xsplit, xtags,
'dummy.my', ['class="sys"', 'id="mem"'])
Result: ["compact"]