David R Newman

Sesame Server Commands

I have encountered several problems whilst trying to use AllegroGrpah's Sesame Server. This is mainly down to the HTTP client that I am using not being fully functional and having to hack the code as I go along. Below is a listing of all the commands I have got working using the infrastucture I build up in Running a Sesame Server on AllegroGraph with useful examples of actually commands that I have submitted that have actually worked.

GET /sesame/protocol

This is a simple command that returns the protocol it is not especially useful except for a test to tell you server is working properly.

GET /sesame/respositories

This will list all the repositories available. These will have to be opened at some point (see POST /sesame/repositories) so if you look initially the list will be empty.

POST /sesame/repositories

This allows you to create new repositories or to open current ones, using the following parameters as a template:

ParameterCreate NewOpen Existing
idmyexpmyexp
if-existssupersedeopen
namemyexperimentmyexperiment
directorytemp/myexptemp/myexp
titlemyexperimentmyexperiment

In all future commands this values will be used. E.g. myexp is the id of the repository so will be used in commands such as GET /sesame/repositories/<id>/namespaces.

GET /sesame/repositories/myexp/namespaces

This allows you to see the namespaces defined for the repository, in this case the repository with the id myexp.

PUT /sesame/repositories/myexp/namespaces/myexpont

This command allows you to add a namespace to the myexperiment repository. In this case we want to add the myexperiment ontology as a namespace. To do tthis the prefix needs to be defined in the command, in this case myexpont and the URL needs to be specified in the body, i.e. http://users.ecs.soton.ac.uk/drn05r/myexperiment/myExperiment.owl#. If you make a mistake in the URL you can just repeat the command and to overwrite the namespace for that prefix.

DELETE /sesame/repositories/myexp/namespaces/myexpont

This command allows you to remove a namespace, which might be useful if you gave it the wrong prefix or just simply don't need it.

GET /sesame/repositories/myexp

This allows you to query the triplestore, in particular SPARQL queries. To do this you need to set the Accept value to application/sparql-results+xml, assuming you are performing a SELECT or ASK request, (CONSTRUCT and DESCRIBE require application/rdf+xml. The following parameters also need to be set, below is an example that will return all the triples in the repository:

ParameterValue
querySELECT ?x ?y ?z WHERE {?x ?y ?z}
queryLnSPARQL

GET /sesame/repositories/myexp/contexts

This returns the contexts of the selected reposistory. I have quite determined the usefulness of this at the moment as I haven'y started to build up my repository yet.

GET /sesame/respositories/myexp/size

This returns the number of triples in the chosen repository. If this is 0 at some point my php script loses this before it is printed out.

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Page written by David R Newman (drn[at]ecs.soton.ac.uk). Last updated November 11 2013 14:34:10.