The Software Product Lines (SPL) has proved very effective in building large-scale software. However, few works seek to adjust the approach of software product line to applications in the context of semantic web. This is because applications in this context assume the use of semantic services and intelligent agents. As a result, it is necessary that there are assets that provide adequate interoperability both semantic services and intelligent agents. In this sense, it is proposed in this paper the use of ontologies for the specification of entire a project of a SPL. With this, it can be a sufficiently formal specification that can be interpreted by both software engineers and computational algorithms.