Software requirements engineering is an important subset of software engineering. There has been many researches study the software requirements engineering field and specially the Software Requirement Specification (SRS). In this paper, a reengineering of the software requirement specifications document, according to an updated version of the IEEE 830 standard, as a semi-structured data using XML technology, was made. It aims to enrich the semantic of the SRS. In addition, it serves the customer and the supplier to have a better understanding and experiencing with SRS. A prototype has been developed to show how the new SRS model works. Also, a case study was taken to illustrate the proposed XML schema. Finally, the performance of the proposed approach was assessed according ten main criteria required in any good SRS.