Data Identification section

Following yesterday's discussion, I've taken a run at re-doing the intro 
to the section on Data Identification and its first BP.

See http://philarcher1.github.io/dwbp/bp.html#DataIdentification



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Phil Archer
W3C Data Activity Lead
http://www.w3.org/2013/data/

http://philarcher.org
+44 (0)7887 767755
@philarcher1