.net - xpath: preceding-sibling-or-self -

.net - xpath: preceding-sibling-or-self -

i'd preceding-sibling-or-self functionality in xpath , i'm using ../(self::*|preceding-sibling::*) , it's giving me expression must evaluate node-set., must doing wrong.

this bombs no matter context node on or xml looks like. want utilize functionality after / need right syntax that.

the xpath look (self::*|preceding-sibling::*) not give error, has place in xpath i'm trying utilize it.

edit:

my error more basic. can't ../(.|.) without error. in general, want go node, through set of nodes there. error seems correlate trying utilize union operator | after slash /.

in xpath, if want utilize union operator, must utilize @ origin of path.

(self::*|preceding-sibling::*)/child ok.

if need something/(self::*|preceding-sibling::*)/child, have expand left part out this:

(something/self::*|something/preceding-sibling::*)/child

.net xpath