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https://issues.apache.org/jira/browse/JENA-1004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649615#comment-14649615
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Andy Seaborne commented on JENA-1004:
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My current preferred solution is option 1.
> Dynamic datasets inconsistently supported in Fuseki.
> ----------------------------------------------------
>
> Key: JENA-1004
> URL: https://issues.apache.org/jira/browse/JENA-1004
> Project: Apache Jena
> Issue Type: Bug
> Components: Fuseki
> Affects Versions: Fuseki 2.0.0
> Reporter: Andy Seaborne
>
> Dynamic datasets, where the dataset to query is constructed out of the graphs
> of the underlying dataset behave differently for in-memory and TDB datasets.
> [TDB supports them
> natively|https://jena.apache.org/documentation/tdb/dynamic_datasets.html]
> when {{FROM}}, {{FROM NAMED}} are used.
> {{SPARQL_QueryDataset#decideDataset}} provides the feature for SPARQL
> protocol ({{default-graph-uri=}}, {{named-graph-uri=}} externally to the
> dataset.
> Other datasets do not support the feature. Henc, in-memory dataset services
> does not support it when {{FROM}}, {{FROM NAMED}} used but does when
> {{default-graph-uri=}}, {{named-graph-uri=}} used.
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