Hi Hugh, in the meantime I solved some of the errors. Assuming the following query is evaluated at endpoint running at port 8893:
SELECT ?x ?a ?b ?P0src ?P1src
WHERE {
{
SERVICE <http://141.87.4.8:8899/sparql> {
?x <http://purl.org/dc/terms/partOf> ?a .
FILTER ( ?x >=
<http://bibsonomy.org/uri/bibtexkey/conf/icmcs/NagatomoYOIT02/dblp> ) .
FILTER ( ?x <
<http://bibsonomy.org/uri/bibtexkey/conf/wpmc/EndoMA14/dblp> ) .
} .
BIND (<http://141.87.4.8:8899/sparql> AS ?P0src)
}
UNION
{
SERVICE <http://141.87.4.8:8891/sparql> {
?x <http://purl.org/dc/terms/partOf> ?a .
FILTER ( ?x >=
<http://bibsonomy.org/uri/bibtexkey/conf/icmcs/NagatomoYOIT02/dblp> ) .
FILTER ( ?x <
<http://bibsonomy.org/uri/bibtexkey/conf/wpmc/EndoMA14/dblp> ) .
} .
BIND (<http://141.87.4.8:8891/sparql> AS ?P0src)
}
UNION
{
?x <http://purl.org/dc/terms/partOf> ?a .
FILTER ( ?x >=
<http://bibsonomy.org/uri/bibtexkey/conf/icmcs/NagatomoYOIT02/dblp> ) .
FILTER ( ?x <
<http://bibsonomy.org/uri/bibtexkey/conf/wpmc/EndoMA14/dblp> ) .
BIND (<http://141.87.4.8:8893/sparql> AS ?P0src)
}
UNION
{
SERVICE <http://141.87.4.8:8895/sparql> {
?x <http://purl.org/dc/terms/partOf> ?a .
FILTER ( ?x >=
<http://bibsonomy.org/uri/bibtexkey/conf/icmcs/NagatomoYOIT02/dblp> ) .
FILTER ( ?x <
<http://bibsonomy.org/uri/bibtexkey/conf/wpmc/EndoMA14/dblp> ) .
} .
BIND (<http://141.87.4.8:8895/sparql> AS ?P0src)
BIND (<http://141.87.4.8:8895/sparql> AS ?P0src)
} .
?b <http://www.aktors.org/ontology/portal#article-of-journal> ?x .
FILTER ( ?x >=
<http://bibsonomy.org/uri/bibtexkey/conf/icmcs/NagatomoYOIT02/dblp> ) .
FILTER ( ?x < <http://bibsonomy.org/uri/bibtexkey/conf/wpmc/EndoMA14/dblp> )
.
BIND (<http://141.87.4.8:8893/sparql> AS ?P1src)
}
If this endpoint has no ?x matching pattern at line 22 of this query, an
exception is thrown. It is possible to avoid that by replacing line 20 to 26 by
UNION
{
{
?x <http://purl.org/dc/terms/partOf> ?a .
FILTER ( ?x >=
<http://bibsonomy.org/uri/bibtexkey/conf/icmcs/NagatomoYOIT02/dblp> ) .
FILTER ( ?x <
<http://bibsonomy.org/uri/bibtexkey/conf/wpmc/EndoMA14/dblp> ) .
}
BIND (<http://141.87.4.8:8893/sparql> AS ?P0src)
}
Best
Andy
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