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https://issues.apache.org/jira/browse/STANBOL-764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13473056#comment-13473056
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Rupert Westenthaler edited comment on STANBOL-764 at 10/10/12 7:57 AM:
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To avoid clashes with bank nodes (Bnodes) in different Graphs the importer
processes those for Subjects and Objects of imported quads.
If the Context is a URI, than BNodes are converted by using the Context URI as
base and the Bnode ID as local name. If the Context is a Bnode, that the Bnode
ID of the Subject/Object is appended (by using '_' as separator) to the Bnode
ID of the context.
e.g. the quad
_:node16nh2jpdcx57591272 <http://xmlns.com/foaf/0.1/name> "Barack Obama"@en
<http://www.huffingtonpost.com/2009/01/13/obama-issues-first-veto-t_n_157585.html>
.
would be imported as Triple
http://www.huffingtonpost.com/2009/01/13/obama-issues-first-veto-t_n_157585.htm#node16nh2jpdcx5759127
<http://xmlns.com/foaf/0.1/name> "Barack Obama"@en .
NOTES:
* This does change the RDF data as anonymous BNodes are converted to
dereferenceable URIs. Because of that this behavior might need some further
discussion
* This does work for BNodes linking to other BNodes as BNodes are only valid
within the same Graph. Meaning that Contexts of Bnodes linking to each other
are ensured to be the same. Therefore also the UIRs, NodeIds of the processed
nodes will match.
was (Author: rwesten):
To avoid clashes with bank nodes (Bnodes) the importer replaces Bnodes with
URIs that use the URI of the context and do add the Bnode ID as local name.
e.g. the quad
_:node16nh2jpdcx57591272 <http://xmlns.com/foaf/0.1/name> "Barack Obama"@en
<http://www.huffingtonpost.com/2009/01/13/obama-issues-first-veto-t_n_157585.html>
.
would be imported as Triple
http://www.huffingtonpost.com/2009/01/13/obama-issues-first-veto-t_n_157585.htm#node16nh2jpdcx5759127
<http://xmlns.com/foaf/0.1/name> "Barack Obama"@en .
One needs to note that this does change the RDF data as anonymous BNodes are
converted to dereferenceable URIs. Because of that this behavior might need
some further discussion
> Add support for importing Quads to the JenaTDB indexing source
> --------------------------------------------------------------
>
> Key: STANBOL-764
> URL: https://issues.apache.org/jira/browse/STANBOL-764
> Project: Stanbol
> Issue Type: New Feature
> Components: Entity Hub
> Reporter: Rupert Westenthaler
> Assignee: Rupert Westenthaler
> Priority: Minor
>
> The Jena TDB indexing source should support quads (Nquads, Trig serialized
> RDF data) by ignoring the context.
> This means that SPO (the triples) are stored to the default dataset of the
> Jena TDB store by ignoring the Context information of the quads.
> see also http://markmail.org/message/jzy6w7abettauxqv
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