Matching data with sparql queries for tiny-mixed-example in Ext-Rescal

(1) Create turtle data:

@prefix dbr: <http://dbpedia.org/resource/> .
@prefix : <http://example.org/> .
dbr:Vibeke :member-of dbr:Tristania .
dbr:Morten :member-of dbr:Tristania .
dbr:Tristania :genre dbr:Metal .
:author1 :cites :author1 .
:author2 :cites :author1 .
:author2 :cites :author2 .

(2) Load data into Blazegraph with a sparql update.

(2) Find all distinct predicates

SELECT DISTINCT ?p
WHERE { ?s ?p ?o . }


<http://example.org/cites>
<http://example.org/genre>
<http://example.org/member-of>

(2a.r) Select the subjects as rows  for  :member-of


SELECT ?s
WHERE { ?s <http://example.org/member-of> ?o . }

s
<http://dbpedia.org/resource/Morten>      === > 2
<http://dbpedia.org/resource/Vibeke>      === > 1 


Check:
Matches  1-rows in tiny-mixed-example:
1 2

(2a.c)  Select the objects as columns  for  :member-of

SELECT ?o
WHERE { ?s <http://example.org/member-of> ?o . }

<http://dbpedia.org/resource/Tristania>  === > 0
<http://dbpedia.org/resource/Tristania>   === > 0



Check:
Matches  1-cols in tiny-mixed-example:
0 0

(2b.r) Select the subjects as rows  for  :genre

SELECT  ?s
WHERE { ?s <http://example.org/genre> ?o . }

<http://dbpedia.org/resource/Tristania>  ==> 0

Check:
Matches  2-rows in tiny-mixed-example:
0

(2b.c) Select the objects as rows  for  :genre

SELECT  ?o
WHERE { ?s <http://example.org/genre> ?o . }

<http://dbpedia.org/resource/Metal>  ==> 3


Check:
Matches  2-cols in tiny-mixed-example:
0

(2c.r) Select the subjects as rows  for  :cites

SELECT  ?s
WHERE { ?s <http://example.org/cites> ?o . }

<http://example.org/author1>  ==> 4
<http://example.org/author2>  ==> 5
<http://example.org/author2>  ==> 5

Check:
Matches  3-rows in tiny-mixed-example:
4 5 5


(2c.c) Select the objects as rows  for  :cites

SELECT  ?o
WHERE { ?s <http://example.org/cites> ?o . }

<http://example.org/author1>   ==> 4
<http://example.org/author1>   ==> 4
<http://example.org/author2>   ==> 5


Check:
Matches  3-cols in tiny-mixed-example:
4 4 5