Note that you said
Get first preceding-sibling of current node that has the ss:Index attrib
^^^^^^^^^
not
Get first preceding-sibling of of the ss:Index attrib of the current node that
has the
^^^^
Th Xpath spelling of "that has" is "[ ]"
so not
preceding-sibling::node()/@ss:Index/preceding-sibling::node()
which counts all the preceding-sblings of the ss:Index attribute, but
attributes don't have siblings.
you want
preceding-sibling::node()[(_at_)ss:Index][1]/preceding-sibling::node()
David
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