Hdt Java

HDT Java library and tools.
Alternatives To Hdt Java
Project NameStarsDownloadsRepos Using ThisPackages Using ThisMost Recent CommitTotal ReleasesLatest ReleaseOpen IssuesLicenseLanguage
Algorithms22,512141a month ago5October 04, 2020200mitPython
Minimal examples of data structures and algorithms in Python
19 days ago24July 10, 202268mpl-2.0Rust
🦔 Fast, lightweight & schema-less search backend. An alternative to Elasticsearch that runs on a few MBs of RAM.
Dsa.js Data Structures Algorithms Javascript7,009
15 months ago44November 30, 20216mitJavaScript
🥞Data Structures and Algorithms explained and implemented in JavaScript + eBook
Levelgraph1,26876352 years ago53August 16, 202146mitJavaScript
Graph database JS style for Node.js and the Browser. Built upon LevelUp and LevelDB.
Ngt1,0323519 hours ago19June 20, 202213apache-2.0C++
Nearest Neighbor Search with Neighborhood Graph and Tree for High-dimensional Data
Graph83034 years ago59April 12, 20164mitSwift
Graph is a semantic database that is used to create data-driven applications.
311 days ago9March 30, 201775otherC++
The OpenCog (hyper-)graph database and graph rewriting system
Cracking The Coding Interview495
2 years ago2bsd-3-clauseC++
:books: C++ and Python solutions with automated tests for Cracking the Coding Interview 6th Edition.
4 years ago4bsd-3-clauseSwift
Sample projects using Material, Graph, and Algorithm.
Facebook Events By Location336425 years ago19February 19, 20182mitJavaScript
[DEPRECATED] A Express.js-based webservice to get public Facebook events by location
Alternatives To Hdt Java
Select To Compare

Alternative Project Comparisons

Join the chat at https://gitter.im/rdfhdt

HDT Library, Java Implementation. http://www.rdfhdt.org


HDT-lib is a Java Library that implements the W3C Submission (http://www.w3.org/Submission/2011/03/) of the RDF HDT (Header-Dictionary-Triples) binary format for publishing and exchanging RDF data at large scale. Its compact representation allows storing RDF in fewer space, providing at the same time direct access to the stored information. This is achieved by depicting the RDF graph in terms of three main components: Header, Dictionary and Triples. The Header includes extensible metadata required to describe the RDF data set and details of its internals. The Dictionary organizes the vocabulary of strings present in the RDF graph by assigning numerical IDs to each different string. The Triples component comprises the internal structure of the RDF graph in a compressed form.

It provides several components:

  • hdt-java-api: Abstract interface for dealing with HDT files.
  • hdt-java-core: Core library for accessing HDT files programmatically from java. It allows creating HDT files from RDF and converting HDT files back to RDF. It also provides a Search interface to find triples that match a specific triple pattern.
  • hdt-java-cli: Commandline tools to convert RDF to HDT, merge two HDT files and access HDT files from a terminal.
  • hdt-jena: Jena integration. Provides a Jena Graph implementation that allows accessing HDT files as normal Jena Models. In turn, this can be used with Jena ARQ to provide more advanced searches, such as SPARQL, and even setting up SPARQL Endpoints with Fuseki.
  • hdt-java-package: Generates a package with all the components and launcher scripts.
  • hdt-fuseki (< 2.2.0): Packages Apache Jena Fuseki with the HDT jars and a fast launcher, to start a SPARQL endpoint out of HDT files very easily.


Use mvn install to let Apache Maven install the required jars in your system.

You can also run mvn assembly:single under hdt-java-package to generate a distribution directory with all the jars and launcher scripts.


Please refer to hdt-java-package/README for more information on how to use the library. You can also find useful information on our Web Page http://www.rdfhdt.org


Each module has a different License. Core is LGPL, examples and tools are Apache.

  • hdt-api: Apache License
  • hdt-java-cli: (Commandline tools and examples): Apache License
  • hdt-java-core: Lesser General Public License
  • hdt-jena: Lesser General Public License
  • hdt-fuseki(< 2.2.0): Apache License

Note that hdt-fuseki has been removed in version 2.2.0 and might be readded later when made compatible with fuseki2.



RDF/HDT is a project developed by the Insight Centre for Data Analytics (www.insight-centre.org), University of Valladolid (www.uva.es), University of Chile (www.uchile.cl). Funded by Science Foundation Ireland: Grant No. SFI/08/CE/I1380, Lion-II; the Spanish Ministry of Economy and Competitiveness (TIN2009-14009-C02-02); Chilean Fondecyt's 1110287 and 1-110066; and the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No 642795.

Popular Search Projects
Popular Graph Projects
Popular Computer Science Categories
Related Searches

Get A Weekly Email With Trending Projects For These Categories
No Spam. Unsubscribe easily at any time.