Introduction

This page gives information about the status of the TOMA query language implementation for Ontopia.

Status

The implementation currently lives in the sandbox part of Subversion, so you must access the sandbox to find it.

The implementation is fully functional, missing parts are as follows:

• square brackets have to be fully supported
• query optimization has to be improved
• improve test coverage & documentation

Compile & Run

Prerequisites

- Apache Maven 2.0 (or later)

Compile

 cd sandbox/toma
 mvn compile package

Commandline

A simple command-line tool to run queries against a topic map is included. To run it, simply type in the following to get a help message:

 cd target
 java -jar toma-{$version}-full.jar

Omnigator Integration

Copy the current toma package to the common library path of the ontopia tomcat instance.

 cp target/toma-{$version}.jar {$ontopia-install-path}/apache-tomcat/common/lib

Select a topic map within omnigator and use the "Generic Query" plugin, where you can select "Toma" as query processor.

Google AppEngine

Toma can also be tested out using a specific version of omnigator deployed to Google AppEngine: http://toma-demo.appspot.com/.

Examples

Some examples based on the famous Italian Opera topic map:

Note: do not forget to escape '$' with '\' when trying to run the examples in a shell.

More examples be found within the 'Generic Query' plugin of Omnigator while using the ItalianOpera.ltm topic map.

Specification

The current specification can be found here: TOMA Specification