xmlns:mynamespace syntax no longer works in UiBinder GWT 2.5

Using xmlns: in UiBinder no longer works.

<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder" xmlns:g="urn:import:com.google.gwt.user.client.ui" 

xmlns:fb="http://ogp.me/ns/fb#" >

Works in GWT 2.4 but no longer works in 2.5.  Error is <<Prefix "fb:" has unrecognized xmlns "http://ogp.me/ns/fb#" (bad import?):>>

Anybody have a workaround other than downgrading?

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