Length of path between nodes, allowing for multiple relation types (SPARQL) -


i have write sparql query returns length of path between 2 nodes (:persa , :persd) connected these relationships:

@prefix : <http://www.example.org/> .  :persa :knows :knowrelation1 . :knowrelation1 :hasperson :persb . :persb :knows :knowrelation2 . :knowrelation2 :hasperson :persc . :persc :knows :knowrelation3 . :knowrelation3 :hasperson :persd .

i tried query:

prefix : <http://www.example.org/>  select (count(?mid) ?length)  {     :persa (:knows | :hasperson)* ?mid .     ?mid (:knows | :hasperson)+ :persd . }

the result seems infinite loop.

any advice/examples of how can done?

after fixing syntax errors in initial post, provided triples , query work me in graphdb free 8.2 , blazegraph 2.1.1. have since applied these edits post itself.

  • added trailing / definition of empty prefix
  • added trailing . prefix definition line (required if want start @)
  • fixed spelling of length (ok, that's cosmetic fix)

.

@prefix : <http://www.example.org/> .  :persa :knows :knowrelation1 . :knowrelation1 :hasperson :persb . :persb :knows :knowrelation2 . :knowrelation2 :hasperson :persc . :persc :knows :knowrelation3 . :knowrelation3 :hasperson :persd .

.

prefix  :     <http://www.example.org/>  select  (count(?mid) ?length)   { :persa (:knows|:hasperson)* ?mid .     ?mid (:knows|:hasperson)+ :persd   }

result:

    length "6"^^xsd:integer

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