This chapter briefly explains the purpose and the scope of this document, its place in the OWLIM user documentation set, and provides some suggestions for efficient use. It starts with an introduction on the differences between the two editions of OWLIM, which facilitates the understanding of the OWLIM product family, the design objectives behind each of the versions and the rationale behind the structuring of the documentation.
OWLIM-Lite and OWLIM-SE are identical in terms of usage and integration. Apart from a few differences in configuration parameters, these editions have the same functionality and implement the same Sesame APIs. However, they use different indexing, inference and query evaluation implementations, which results in different performance, memory requirements, and scalability.
OWLIM-Lite is designed for medium data volumes (below 100 million statements) and for prototyping. Its key characteristics are as follows:
OWLIM-SE is suitable for handling massive volumes of data and very intensive querying activities. It is designed as an enterprise-grade database management system. This has been made possible through:
OWLIM-Enterprise is a component that can manage and synchronise multiple OWLIM instances in a resilient and scalable cluster configuration.
Further discussion on the differences between OWLIM's editions can be found in the OWLIM Primer. There is also a roadmap that shows the development plans for each of these editions.
This document is designed for software engineers, system integrators and system administrators who wish to integrate the OWLIM-Lite semantic repository in to their applications or who wish to use OWLIM-Lite and Sesame as a stand-alone server for storing and processing structured data. It is also useful for system administrators who need to support and maintain a OWLIM-Lite repository.
The reader is assumed to be familiar with databases, but not an expert in semantic database systems, semantic information retrieval, Semantic Web, or OWLIM itself. Less experienced readers are recommended to read the OWLIM Primer where the required minimum of Semantic Web and related concepts is covered, as well as OWLIM basics.
Readers new to OWLIM should read the OWLIM Primer first and then this document in its entirety. This will guarantee that the necessary basic information has been covered in sufficient depth. After some experience using OWLIM, this guide can be used as a reference for carrying out specific tasks.
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