[U2] syntax for joining two files in Retrieve statement using Universe

[k_hw]

I would like to populate a Retrieve statement in Universe joining two files 
linking common fields in those two files. What would be the syntax to use to 
accomplish my need? If I want to list in that Retrieve statement,  dictionary 
and non-dictionary items, is it just enough to Prefix the file name with a 
period after -example PM.PMID, POLI.VENDOR.
Thanks for the help.
Krish 
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