SPARQL ElementPathBlock
In am trying to retrieve the triples of a SPARQL expression involved in the OPTIONAL and NON OPTIONAL part of the query, separately.
I used the API ARQ Jena visitor but neither ElementPathBlock nor ElementGroup nor ElementOptional are enough. ElementPathBlock retrieves all the triples, and ElementGroup retrieves the groups of triples (enclosed by {}), and ElementOptional the optional Elements.
Could you help me please?
api sparql jena arq
edited Nov 22 '18 at 21:39
user6910411
33.2k97398
asked Nov 22 '18 at 16:15
Jesús AlmendrosJesús Almendros
11
add a comment |
In am trying to retrieve the triples of a SPARQL expression involved in the OPTIONAL and NON OPTIONAL part of the query, separately.
I used the API ARQ Jena visitor but neither ElementPathBlock nor ElementGroup nor ElementOptional are enough. ElementPathBlock retrieves all the triples, and ElementGroup retrieves the groups of triples (enclosed by {}), and ElementOptional the optional Elements.
Could you help me please?
api sparql jena arq
edited Nov 22 '18 at 21:39
user6910411
33.2k97398
asked Nov 22 '18 at 16:15
Jesús AlmendrosJesús Almendros
11
The SPARQL structure is hierarchical, i.e. elements are usually nested. That means, the OPTIONAL might be inside anElementGroupetc.ElementWalkeris probably the way to go
– AKSW
Nov 22 '18 at 17:32
add a comment |
In am trying to retrieve the triples of a SPARQL expression involved in the OPTIONAL and NON OPTIONAL part of the query, separately.
I used the API ARQ Jena visitor but neither ElementPathBlock nor ElementGroup nor ElementOptional are enough. ElementPathBlock retrieves all the triples, and ElementGroup retrieves the groups of triples (enclosed by {}), and ElementOptional the optional Elements.
Could you help me please?
api sparql jena arq
edited Nov 22 '18 at 21:39
user6910411
33.2k97398
asked Nov 22 '18 at 16:15
Jesús AlmendrosJesús Almendros
11
In am trying to retrieve the triples of a SPARQL expression involved in the OPTIONAL and NON OPTIONAL part of the query, separately.
I used the API ARQ Jena visitor but neither ElementPathBlock nor ElementGroup nor ElementOptional are enough. ElementPathBlock retrieves all the triples, and ElementGroup retrieves the groups of triples (enclosed by {}), and ElementOptional the optional Elements.
Could you help me please?
api sparql jena arq
api sparql jena arq
edited Nov 22 '18 at 21:39
user6910411
33.2k97398
asked Nov 22 '18 at 16:15
Jesús AlmendrosJesús Almendros
11
edited Nov 22 '18 at 21:39
user6910411
33.2k97398
asked Nov 22 '18 at 16:15
Jesús AlmendrosJesús Almendros
11
edited Nov 22 '18 at 21:39
user6910411
33.2k97398
edited Nov 22 '18 at 21:39
user6910411
33.2k97398
edited Nov 22 '18 at 21:39
user6910411
33.2k97398
33.2k97398
asked Nov 22 '18 at 16:15
Jesús AlmendrosJesús Almendros
11
asked Nov 22 '18 at 16:15
Jesús AlmendrosJesús Almendros
11
asked Nov 22 '18 at 16:15
Jesús AlmendrosJesús Almendros
11
11
The SPARQL structure is hierarchical, i.e. elements are usually nested. That means, the OPTIONAL might be inside anElementGroupetc.ElementWalkeris probably the way to go
– AKSW
Nov 22 '18 at 17:32
add a comment |
The SPARQL structure is hierarchical, i.e. elements are usually nested. That means, the OPTIONAL might be inside anElementGroupetc.ElementWalkeris probably the way to go
– AKSW
Nov 22 '18 at 17:32
The SPARQL structure is hierarchical, i.e. elements are usually nested. That means, the OPTIONAL might be inside an
ElementGroup etc. ElementWalker is probably the way to go– AKSW
Nov 22 '18 at 17:32
The SPARQL structure is hierarchical, i.e. elements are usually nested. That means, the OPTIONAL might be inside an
ElementGroup etc. ElementWalker is probably the way to go– AKSW
Nov 22 '18 at 17:32
add a comment |
1 Answer
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Thanks for your answer. I found the solution. I was using the ElementWalker as you suggested. However, ElementWalker is not useful (or I could not find the good way) for the traversal of a SPARQL query as usual, I means left-to-right and top-down traversal. I had to write my own method for the traversal of a SPARQL using instanceof, and each type of SPARQL expression: ElementPathBlock, ElementOptional, etc, and recursion. In this way, I was able to extract the optional part (and mandatory part) of the query, as well as union and minus, etc.
answered Dec 5 '18 at 9:59
Jesús AlmendrosJesús Almendros
11
add a comment |
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1 Answer
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1 Answer
1
active
oldest
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active
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votes
Thanks for your answer. I found the solution. I was using the ElementWalker as you suggested. However, ElementWalker is not useful (or I could not find the good way) for the traversal of a SPARQL query as usual, I means left-to-right and top-down traversal. I had to write my own method for the traversal of a SPARQL using instanceof, and each type of SPARQL expression: ElementPathBlock, ElementOptional, etc, and recursion. In this way, I was able to extract the optional part (and mandatory part) of the query, as well as union and minus, etc.
answered Dec 5 '18 at 9:59
Jesús AlmendrosJesús Almendros
11
add a comment |
Thanks for your answer. I found the solution. I was using the ElementWalker as you suggested. However, ElementWalker is not useful (or I could not find the good way) for the traversal of a SPARQL query as usual, I means left-to-right and top-down traversal. I had to write my own method for the traversal of a SPARQL using instanceof, and each type of SPARQL expression: ElementPathBlock, ElementOptional, etc, and recursion. In this way, I was able to extract the optional part (and mandatory part) of the query, as well as union and minus, etc.
answered Dec 5 '18 at 9:59
Jesús AlmendrosJesús Almendros
11
add a comment |
Thanks for your answer. I found the solution. I was using the ElementWalker as you suggested. However, ElementWalker is not useful (or I could not find the good way) for the traversal of a SPARQL query as usual, I means left-to-right and top-down traversal. I had to write my own method for the traversal of a SPARQL using instanceof, and each type of SPARQL expression: ElementPathBlock, ElementOptional, etc, and recursion. In this way, I was able to extract the optional part (and mandatory part) of the query, as well as union and minus, etc.
answered Dec 5 '18 at 9:59
Jesús AlmendrosJesús Almendros
11
Thanks for your answer. I found the solution. I was using the ElementWalker as you suggested. However, ElementWalker is not useful (or I could not find the good way) for the traversal of a SPARQL query as usual, I means left-to-right and top-down traversal. I had to write my own method for the traversal of a SPARQL using instanceof, and each type of SPARQL expression: ElementPathBlock, ElementOptional, etc, and recursion. In this way, I was able to extract the optional part (and mandatory part) of the query, as well as union and minus, etc.
answered Dec 5 '18 at 9:59
Jesús AlmendrosJesús Almendros
11
answered Dec 5 '18 at 9:59
Jesús AlmendrosJesús Almendros
11
answered Dec 5 '18 at 9:59
Jesús AlmendrosJesús Almendros
11
answered Dec 5 '18 at 9:59
Jesús AlmendrosJesús Almendros
11
11
add a comment |
add a comment |
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The SPARQL structure is hierarchical, i.e. elements are usually nested. That means, the OPTIONAL might be inside an
ElementGroupetc.ElementWalkeris probably the way to go– AKSW
Nov 22 '18 at 17:32