solrconfig.xml carrot2 params

[youknow...@heroicefforts.net]

Would someone help me out with the syntax for setting Tokenizer.documentFields 
in the ClusteringComponent engine definition in solrconfig.xml?  Carrot2 is 
expecting a Collection of Strings.  There's no schema definition for this XML 
file and a big TODO on the Wiki wrt init params.  Every permutation I have 
tried results in an error stating:  Cannot set java.until.Collection field ... 
to java.lang.String.
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