openRDF.org Issue Tracker

[SES-1094] Add support for JSON-LD format

Tue, 6 Nov 2012 22:44:19 +0100 (CET)

[SES-1123] Query builder tool

Tue, 6 Nov 2012 21:23:42 +0100 (CET)

Query builder tool

[SES-1122] System documentation missing block diagram

Tue, 6 Nov 2012 16:22:45 +0100 (CET)

docs/system/figures/block-diagram.png referred to by docs/system/ch02.html#figure-sesame-arch is missing from the downloadable Sesame SDK file

[SES-1121] Name of variable in query seems to introduce a parse issue

Fri, 2 Nov 2012 21:24:47 +0100 (CET)

Code to reproduce is at [1] as well as the output I'm seeing. What I'm seeing is for two queries which are exactly the same except for name of a variable in the object position of a triple pattern produce different algebra representations; the order of the joins are reversed. Unfortunately, because they're optional joins, the alternate ordering has different semantics than the correct representation, so it seems that depending on the name of a var, I can get an incorrect algebra and thus incorrect results. The first query parses correctly producing the algebra I'd expect, the second in which the variable ?c is renamed ?var2, the join is reversed.

The parse order is correct from what I can tell, the predicate has a bound value in both triple patterns, and in both cases, the predicate of the first triple pattern is named const-1, which afaiu, means it was parsed first. So I'm not sure at what point they get switched and the join ends up wrong, but it seems to happen every single time on my machine.

If you use ARQ (sparql.org) to parse the query, you can see that it produces the same algebra sesame produces when it's correct.

[1] https://gist.github.com/3988683

[SES-1120] SameTerm inlining optimization can alter semantics of a query yielding incorrect results during evaluation

Fri, 2 Nov 2012 21:20:37 +0100 (CET)

the inlining optimization can incorrectly inline a graph variable, for example:

graph ?g {
... BGPs, none of which bind ?g ...
filter (sameTerm(?g, <urn:foo>))
}

Sesame's sameTerm inliner will push the value of urn:foo into ?g, which while likely what the user meant, is not correct. If no BGP's bind ?g in that graph clause, it's unbound when the sameTerm filter would normally get eval'ed and thus it should fail and produce no results.

I think this (and SES-1119) are both related to how the context of the query is represented in the algebra, where it's pushed into the leaf nodes where it's needed, the StatementPatterns, which makes it difficult to scope correctly for optimizations like the sameTerm inliner.

[SES-1119] SingletonSet is incorrect wrt to a Graph clause

Fri, 2 Nov 2012 21:18:54 +0100 (CET)

If you have a dataset which includes n named graphs (where n >= 1) the query "select ?g where { graph ?g {} }" should produce n results where each ?g in each result is bound to a named graph identifier. Sesame returns a single empty result because SingletonSet does not have any information about any graph clause it is participating in.

[SES-1057] Parameters Not Bound in SERVICE Block

Thu, 1 Nov 2012 02:40:52 +0100 (CET)

If a variable is bound using the setBinding method of the Query object, it is ignored if the variable is used within a SERVICE block. However, if a BINDINGS clause is used, the variable is bound both in and out of the SERVICE block.

SELECT * {SERVICE <http://services.data.gov/sparql> {
<http://www.openlinksw.com/virtrdf-data-formats#sinv> ?p ?o
FILTER (?o = $b)
}
}

query.setBinding("b", con.getValueFactory().createLiteral("sinv"));

The above produces no results, when "b" is bound using the above method. However, the query below does produce a result. I would expect both results to be identical.

SELECT * {SERVICE <http://services.data.gov/sparql> {
<http://www.openlinksw.com/virtrdf-data-formats#sinv> ?p ?o
FILTER (?o = $b)
}
} BINDINGS $b {
("sinv")
}

p,o,b
http://www.openlinksw.com/schemas/virtrdf#qmfName,sinv,sinv

[SES-1081] SameTerm With BINDING Clause Always Fails

Related — Thu, 1 Nov 2012 02:40:52 +0100 (CET)

The following query always returns an empty result.

SELECT * { ?s ex:p ?a FILTER sameTerm(?a,?e) } BINDINGS ?e {(ex:A)}

[SES-1118] Query.setMaxQueryTime should have an equivalent in Update operations

Tue, 30 Oct 2012 23:23:47 +0100 (CET)

See http://sourceforge.net/mailarchive/message.php?msg_id=30002138:

"In the Sesame API, the Query interface has
setMaxQueryTime()/getMaxQueryTime() methods. Is there any particular reason
why this isn't on Operation, so that it applies to Updates as well? The
'WHERE' part of an INSERT or DELETE query for example, is much like any
other query, so being able to stop these from running forever seems as
important as it is for queries."

[SES-1117] ServiceRegistry uses class restricted by Google App Engine

Sat, 27 Oct 2012 18:28:47 +0200 (CEST)

ServiceRegistry uses the javax.imageio.spi.ServiceRegistry class. However, this class is restricted in the Google App Engine, which prohibits calls like repoConn.prepareTupleQuery(QueryLanguage.SPARQL, sparqlString); in code deployed there. The following note is already in the file:

// Note: Using javax.imageio.spi.ServiceRegistry as it publicly exposes
// the sun.misc.Service functionality. Starting from Java 6, this
// functionality is also available java.util.ServiceLoader
Iterator<S> services = javax.imageio.spi.ServiceRegistry.lookupProviders(serviceClass, serviceClass.getClassLoader());

Proposal: Changing this code to the non-restricted java.util.ServiceLoader in future releases as mentioned in the comment.

[SES-1072] Allow users to save and retrieve SPARQL and SeRQL queries in the Workbench

Wed, 24 Oct 2012 21:48:41 +0200 (CEST)

At least one commercial RDF repository has the capability to save and retrieve SPARQL queries within its web interface. This would also be a very useful feature for OpenRDF Workbench. Currently, I have to use cut-and-paste with a text editor or the Sesame Windows Client to save queries. However, the capability to share these queries with co-workers directly on the workbench is still very desirable.

One immediate question to be answered for any implementation of this: where to save the queries: in the repository folder? in the SYSTEM repository?

[SES-1116] Sesame's query API should protect against SPARQL/SeRQL Injection attacks

Wed, 24 Oct 2012 21:44:29 +0200 (CEST)

SPARQL/SeRQL/RDQL can be subject to injection attacks just like SQL. See http://www.slideshare.net/Morelab/sparqlrdqlsparul-injection for details.

It would be good to provide an API call similar to java.sql.Connection.prepareStatement(...) that can sanitize parameters provided to a query template.

[SES-1111] Improve transaction handling in SailConnection

Tue, 23 Oct 2012 08:09:55 +0200 (CEST)

This task will involve several extensions to the sail api, including a new begin() method to indicate a transaction has started.

[SES-945] Update Turtle parser to current W3C Working draft

Dependency — Tue, 23 Oct 2012 02:45:58 +0200 (CEST)

The Rio turtle parser and writer are currently based on the 2006 version of the Turtle format as defined by Dave Beckett (see http://www.dajobe.org/2004/01/turtle/ ).

However, W3C is officially standardizing Turtle, currently it's a working draft (see http://www.w3.org/TR/turtle/ ). Our Turtle parser should be updated to reflect this updated spec.

A partial was already done to address one specific incompatibility (see ~~SES-935~~ ), but we need to review the spec and the parser/writer in more detail to flush out any incompatibilities.

[SES-875] Deploy sesame to maven-central (via sonatype) instead of repo.aduna-software.org

Dependency — Tue, 16 Oct 2012 06:27:12 +0200 (CEST)

Requested by many users with projects that depend on Sesame. This will make it possible for them to deploy to maven-central also.

[SES-719] Unable to use the workbench when the repository is password-protected on the server

Dependency — Mon, 15 Oct 2012 17:58:15 +0200 (CEST)

I have deployed openrdf-workbench and openrdf-sesame both on a tomcat server using basic auth password protection. I get prompted for userid and password to show the workbench or the openrdf-sesame start page, that works fine.

However when I try to work with the openrdf-sesame component in the openrdf-workbench, the URL is not accepted and the error message "Invalid server URL" is always shown.

I tried these four versions of the URL (the workbench is on http://my.server.com:8080/openrdf-workbench)
* http://my.server.com:8080/openrdf-sesame
* http://user:pass@my.server.com:8080/openrdf-sesame
* http://localhost:8080/openrdf-sesame
* http://use:pass@localhost:8080/openrdf-sesame

The logs show the error message: "java.io.IOException: Server returned HTTP response code: 401 for URL: <theURL>" for all those.
If there is a way to do this correctly I could not find it in the documentation.

[SES-1114] Workbench needs JavaScript for correct functioning. Pages should include