[gatein-dev] XML Parsing, where do we stand

[Thomas Heute]

Nick, Julien, Alain,

As said before we'd like to harmonize the XML parsing accross the GateIn 
projects. Let's kill this once for all...

It doesn't mean we would change the existing parsers overnight but it 
means we will impose a way for any new parsing (or when we decide to 
rewrite a parser).

If we need parser tools, they will go in Common module ultimately. There 
might be a phase when the code will be duplicated (as Nick's tools need 
to work on an untouched portal where upgrading common is not an option).

We already agreed that StAX as a base was the way to go, I hope we still 
agree ;)

Let's separate in reading/writing XML (doesn't necessarily necessarily 
mean marhalling/unmarshalling BTW) and agree on both.

Reading XML:
     Option 1:
         Plain StAX, JBoss AS 7 uses that (in fact they use StAX Mapper, 
a very lightweight library made by the JBoss AS7 team. 
https://github.com/jbossas/staxmapper/ which only helps to work with 
multiple namespaces + some little helpers for ignoring part of the file, 
format the XML when writing...)
         One example of JBoss AS 7 parsing file: 
https://github.com/emuckenhuber/jboss-as/blob/master/web/src/main/java/org/jboss/as/web/WebSubsystemParser.java
     Option 2:
         Nick's stuff (please explain advantages/drawbacks)
     Option 3:
         Julien/Alain's stuff (please explain advantages/drawbacks)

Writing XML:
     Option 1:
         Plain StAX (well-formed guaranteed over plain Writer)
     Option 2:
         Nick's stuff (please explain advantages/drawbacks)
     Option 3:
         Julien/Alain's stuff (please explain advantages/drawbacks)

Note that there are other utilities and frameworks based on StAX:
     Stax-Utils: http://stax-utils.dev.java.net/
     StaxMate: http://wiki.fasterxml.com/StaxMateHome
     Apache Axiom: http://ws.apache.org/commons/axiom/

Thomas/
/
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