/data/animals/animal[(_at_)id = /data/code/record[field[(_at_)id = ( '60' )
]]/@id]
The above '60' is in correct context of /data/animals/animal (it is
the value of id).. do I lose context on the right hand side of this
equation?
The context on the right of the = is the same as that on the left,
namely the field node, which is why the @id to the left of the = selects
id attributes of field.
so
/data/animals/animal[(_at_)id = /data/code/record[field[(_at_)id = (
preceding-sibling::animal[1]/@id ) ]]/@id]
will always compare @id to the empty set as the field element has no
sibling element called animal.
Too late to really check, but I suspect that you can't do this with a
single xpath if you don't allow yourself any variables or the current()
function (eg as provided by xslt).
David
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