What is MyRDF?

MyRDF is a datastore for W3C RDF data built on PostgreSQL RDBMS. It tries to be small and practical, while conforming to RDF semantics.

It installs as a set of tables and functions in a PostgreSQL database instance. No extra libraries on the client are needed.

Features

• Functional SQL API for manipulating and querying RDF data.
• Suport for languages and datatypes, per RDF.
• Loading and unloading of models. Each RDF statement belong to some model, typically the URL of the imported RDF file.
• Quintuple store (subject,pedicate,object,context,model)
• Small and powerful. Implemented in PL/PgSQL and PL/Perl. Uses some standard Perl libraries.
• Uses Redland for robust RDF parsing, so several input formats can be supported. We'll try to get rid of that.

Schema

See here: «schema» RDF

Roadmap

• Partitioning by namespace, model, subject, predicate, object
• SPARQL to SQL function compiler, add table of queries
• XUL+PHP web interface
• implement turtle datatype in C
• Add pointer to namespace for resources? (this can save a lot of space by factoring-out common url prefixes, and looks better to human too)
• create table for blank nodes, probablu named blank or node.

Partitioning

Partitioning should be possible in multiple ways; Normally, all statements are stored in statement table. This table can be further partitioned for particular namespace, model, subject, predicate or object

• We need a function, which given a statement returns a partition name, like
  • statement -> statement_n###m###s###p###o### for namespace, model, subject, predicate, object

Planned Updates

ALTER DOMAIN nid RENAME to rid;
CREATE DOMAIN sid BIGINT;
ALTER TABLE statement ALTER sid TYPE sid;
ALTER TABLE property RENAME view_name TO sql_identifier;
CREATE FUNCTION query(subject,predicate,object,context) RETURNS SETOF statement;
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