Description
Walk through all the children inside the
given node until the last element is being
reached.
Defs requires a filtered approach.
Only a limited number of elements are
allowed for defs:
image, pattern, mask, marker, linearGradient,
radialGradient, anything else is ignored.
xlink:href and use still reinject those
elements. It might be necessary to redefine
the filter for defs, when zinc code is gnerated
since zinc has the capacity to work with templates.