  In this article, when G is a locally compact quantum group, we associate to a
braided-commutative G-Yetter-Drinfel'd algebra $(N,a,\hat{a})$ equipped with a
normal faithful semi-finite weight verifying some appropriate condition, a
structure of a measured quantum groupoid. The dual structure is then given by
$(N,\hat{a},a)$. Examples are given, especially the situation of a quotient
type co-ideal of a compact quantum group. This construction generalizes the
standard construction of a transformation groupoid. Most of the results were
announced by the second author in 2011, at a conference in Warsaw.
