I searched for a while on this topic and found some results too, which I am mentioning at the end of post. Can someone help me precisely answer these three questions for the cases listed below them?

1. For which use-cases using XmlSluper makes more sense than XmlParser and vice-versa (from point of view ease of use of API/Syntax)?

2. Which one is more memory efficient? (looks like Slurper)

3. which one processes the xml faster?

Case a. when I have to read almost all nodes in the xml?

Case b. when I have to read just few nodes (like using gpath expression)?

Case c. when I have to update/transform the xml?


provided the xml document is not trivial one (with level of depths and size of the xml).


**Resources** : 

http://www.tutkiun.com/2009/10/xmlparser-and-xmlslurper.html states :

&gt; Difference between XMLParser and XMLSlurper:
&gt; 
&gt; There are similarities between XMLParser and XMLSlurper when used for
&gt; simple reading but when we use them for advanced reading and when
&gt; processing XML documents in other formats there are differences
&gt; between two.
&gt; 
&gt; XMLParser stores intermediate results after parsing documents. But on
&gt; the other hand, 
&gt; 
&gt; XMLSlurper does not stores internal results after processing XML
&gt; documents.
&gt; 
&gt; The real, fundamental differences become apparent when processing the
&gt; parsed information. That is when processing with direct in-place data
&gt; manipulation and processing in a streaming scenario.

http://groovy.dzone.com/news/john-wilson-groovy-and-xml

The groovy doc ([XmlParser][1], [XmlSlurper][2]) and the groovy&#39;s site explains them well ([here][3] and [here][4])but does not do a great job in explaining the aforementioned question.


  [1]: http://groovy.codehaus.org/api/groovy/util/XmlParser.html
  [2]: http://groovy.codehaus.org/api/groovy/util/XmlSlurper.html
  [3]: http://groovy.codehaus.org/Reading+XML+using+Groovy%27s+XmlSlurper
  [4]: http://groovy.codehaus.org/Reading+XML+using+Groovy%27s+XmlParser

All Xmlslurper Solutions on Gang of Coders

Total of 1 Xmlslurper Solutions

Groovy XmlSlurper vs XmlParser