The reasoning to choose JSON to express the RP's Metadata was that ISAa ISAs on mobile devices are not well suited to parse XML. Lest generate or validate xml signatures.
Some discussion about this example JSON can be found in the ULX mail archive: http://kantarainitiative.org/pipermail/wg-ulx/2010-October/date.html
The JSON is outlined along Mozilla's AccountManager spec: https://wiki.mozilla.org/Labs/Weave/Identity/Account_Manager/Spec/3
Axel Nennker contributed the following:
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