The XArc proposal was done by Gabe Beged-Dov before he joined the WG, his rationales are to simplify the syntax, and move toward an RDF like modelling of links. The debate in the IG list generate quite some heat.
The working group accepted to add Arcs support in the draft, but the minimalists now want to get rid of the "old stuff" ...
A cleaner spec sounds nice, the problem is that the ancient still have control and this doesn't really help the WD publication schedule.
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