Data Model Integration

There has been significant recent interest in data integration and querying heterogeneous data sources. Thus, in our work, we aim to develop a system for querying databases regardless of the nature of their model, especially XML and relational data model as they are increasingly related in practice, Due to that we choose to make them the first models under study in this contribution. In fact, the relational model is the most dominated data model in most organizations, and it has utility widely used to manage and maintain a large volume of data. At the same time, XML is increasingly becoming the lingua franca of data interchange and has received considerable attention due to its multiple benefits. Besides, each one of these models has its specific query languages, and it will be important to ensure a flexible way to access information represented by both technologies. Thus, this paper addresses the problem of accessing data independently of the model used, by using a unique query language. Since users and even developers may not be familiar with multiple query language syntax at a time, we need to facilitate accessing data by making one single query in any query language enough to retrieve data from any data model.