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Release 2.0.0

  • A new class RDF::Changeset has been added. This is meant to replace any previous use of RDF::Transaction, which in fact used to in RDF.rb 1.x represent more of a buffered changeset than a genuine transaction scope.

    • Instead of RDF::Transaction.execute, use RDF::Changeset.apply.
    • Instead of RDF::Transaction#execute, use RDF::Changeset#apply.

  • The RDF::Transaction class has been substantially revamped, including some minor backwards-incompatible changes. These changes will mostly affect repository implementors, not so much general RDF.rb users.

    The changes reflect the expanded purpose of the class: instead of being a mere buffered changeset (for which, see RDF::Changeset), transactions are now intended to provide a proper ACID scope for repository queries and mutations.

    We always now also carefully distinguish between read-only and read/write transactions, in order to enable repository implementations to take out the appropriate locks for concurrency control. Note as well that transactions are now read-only by default; mutability must be explicitly requested on construction in order to obtain a read/write transaction.

    In case repository implementations should be unable to provide actual ACID guarantees for transactions, that must be clearly indicated in their documentation. Similarly, implementations should throw an exception when appropriate in case they don't provide write transaction support.

    • RDF::Transaction#initialize now takes the target repository as its first argument. Transactions are now always tied to a specific repository instance, instead of being free-floating objects as they used to be (for that, see RDF::Changeset).

    • RDF::Transaction now mixes in RDF::Queryable and RDF::Enumerable, enabling quad-pattern matches and BGP queries to execute in a proper transaction scope.

    • The RDF::Transaction#context accessor, and its aliases, have been removed. Transactions aren't necessarily scoped to a single graph only.

    • There is a new RDF::Transaction#repository accessor for retrieving the target repository object that the transaction operates upon.

    • There is a new RDF::Transaction#buffered? predicate for testing whether the changeset that constitutes a transaction is available for introspection. Particular repository implementations may support both options and permit the user the choice on transaction construction.

    • The RDF::Transaction#inserts and #deletes methods are deprecated. Instead, there is a new RDF::Transaction#changes accessor to retrieve an RDF::Changeset instance, which contains corresponding methods. For unbuffered transactions, #changes returns nil.

  • Enumerables vs. Enumerators

    • RDF::Queryable#query and RDF::Query#execute did not return an enumerable, which may be an enumerator. Most internal uses return an Array now, which aides performance for small result sets, but potentially causes problems for large result sets. Implementations may still return an Enumerator, and Enumerators may be passed as arguments.
    • RDF::Enumerable#statements, #quads, #triples, #subjects, #predicates, #objects, and #contexts now return an array rather than an Enumerator.

  • The following vocabularies are deprecated and have been moved to the rdf-vocab gem.

    • RDF::CC - Creative Commons (CC)
    • RDF::CERT - W3 Authentication Certificate (CERT)
    • RDF::DC - Dublin Core (DC)
    • RDF::DC11 - Dublin Core 1.1 (DC11) deprecated
    • RDF::DOAP - Description of a Project (DOAP)
    • RDF::EXIF - Exchangeable Image File Format (EXIF)
    • RDF::FOAF - Friend of a Friend (FOAF)
    • RDF::GEO - WGS84 Geo Positioning (GEO)
    • RDF::GR - GoodRelations (GR)
    • RDF::HT - Hypertext Transfer Protocol (HT)
    • RDF::ICAL - RDF Calendar Workspace (ICAL)
    • RDF::MA - Media Resources (MA)
    • RDF::MO - Music Ontology (MO)
    • RDF::OG - Open Graph protocol (OG)
    • RDF::PROV - Provenance on the web (PROV)
    • RDF::RSA - W3 RSA Keys (RSA)
    • RDF::RSS - RDF Site Summary (RSS)
    • RDF::SCHEMA - Schema.org (SCHEMA)
    • RDF::SIOC - Semantically-Interlinked Online Communities (SIOC)
    • RDF::SKOS - Simple Knowledge Organization System (SKOS)
    • RDF::SKOSXL - SKOS eXtension for Labels (SKOSXL)
    • RDF::V - RDF data vocabulary (V)
    • RDF::VCARD - Ontology for vCards (VCARD)
    • RDF::VMD - Data-Vocabulary.org (VMD)
    • RDF::VOID - Vocabulary of Interlinked Datasets (VOID)
    • RDF::VS - SemWeb Vocab Status ontology (VS)
    • RDF::WDRS - Protocol for Web Description Resources (WDRS)
    • RDF::WOT - Web of Trust (WOT)
    • RDF::XHTML - Extensible HyperText Markup Language (XHTML)
    • RDF::XHV - XHTML Vocabulary (XHV)