I've got a query like this::
PREFIX...
SELECT ?author_uri ?author_name ?mbox ?link ?title ?term ?scheme ?entry_id
WHERE {
?author_uri foaf:name ?author_name .
?author_uri foaf:mbox ?mbox .
?annotation annotea:author ?author_uri .
?annotation annotea:annotates ?link .
?annotation annotea:body ?term_uri .
?annotation annotea:related ?entry_uri .
?entry_uri rdf:type atom:entry .
?entry_uri rdf:ID ?entry_id .
?term_uri rdfs:label ?term .
?term_uri rdf:type foaf:topic .
OPTIONAL {?link dc:Title ?title .}
OPTIONAL {?term_uri tagger:hasScheme ?scheme .}
?annotation annotea:annotates <http://example.org/ann-page.html> .
}
This query used to return 'None' for the bound names in the OPTIONAL
blocks, now it errors out upon this assertion in line 703::
assert maxKeys == bound.bindings.keys()
when say, ?title or ?scheme are not found in the data.
Shouldn't the optional values still be bound even if not applicable?
this would seem to limit the usage of optional to only time when you
knew it to exist... therefore it would not be OPTIONAL...
or maybe there is some other way to do this in sparql I have not found?
-w
--
------ d. whit morriss ------
- senior engineer, opencore -
- http://www.openplans.org -
- m: 415-710-8975 -
"If you don't know where you are,
you don't know anything at all"
Dr. Edgar Spencer, Ph.D., 1995
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