Cellosaurus RDF downloads

The RDF data is available as a compressed tar file. It contains several files in Turtle format (ttl) including both ontology, metadata, query examples and data.
The content reflects what is made available at our sparql endpoint.

cellosaurus_ttl.tar.gz

In addition we provide with additional Turtle files which can be loaded on top of those in cellosaurus_ttl.tar.gz in order to speed up the execution of some SPARQL queries especially for triple stores with low memory resources (RAM).
The additional files contain the materialization of some inferable triples. In RDF/SPARQL materialization refers to the process of explicitly generating and storing all possible inferred triples based on the existing data and defined rules or ontologies. This process involves:

Applying inference rules to the existing RDF data
Creating new triples that logically follow from the original data
Storing these newly inferred triples alongside the original data

Materialization can help in several ways:

Query Performance : It improves query execution speed by pre-computing inferred relationships, eliminating the need for real-time inference during query processing
Simplified Querying : Users can write simpler queries without needing to account for complex inference rules, as all possible relationships are already explicit in the data
Consistency : It ensures that all applications accessing the data see the same inferred information, maintaining consistency across different use cases
Scalability : For large datasets, materialization can be more efficient than computing inferences on-the-fly, especially when the same inferences are needed repeatedly

In our case, the usage of inferred triples makes the usage of "*", "?", "+" and "{n,m} symbols in SPARQL query property path expressions unnecessary and may notably improve performance on queries involving a concept and all the concepts that are more specific than it according to some concept scheme. For example:

select * where {
  ?something ?related_somehow_to ?any_concept .
  ... 
  ?any_concept cello:more_specific_than* ?concept .
  ?concept skos:inScheme db:NCBI_TaxID ; skos:notation "50557"^^xsd:string .  # Insecta
}

would not require "*" (a path of zero or more occurrences of cello:more_specific_than) and would run faster after loading the files proposed below. The files can be found here:

RDF files download