[dna-dev] DNA SPI changes

[Randall Hauch]

I've merged the latest state of the 'federation' branch back onto  
trunk.  This consists almost entirely of additions, with most of them  
pertaining to working with properties and property values.

The main reason for this was that we've gotten some feedback from  
people working on new sequencers, and the SPI being developed on the  
federation branch had enough benefits to warrant using them in the  
sequencing framework.  For example, one requested change (http://jira.jboss.com/jira/browse/DNA-77 
) is to add more methods so StreamSequencer implementations can record  
properties using paths and the actual data types (without having to  
convert to Strings).  There are also a few bugs with the  
'org.jboss.dna.common.jcr.Path' class used by several of the existing  
sequencers, which has been removed and replaced with an interface and  
implementation in the new SPI.

Needless to say, there will be in the near future some good  
improvements coming to the SequencerOutput interface, and the existing  
sequencers will be changed to take advantage of these.

Randall
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