Query optimization for inter document relationships in XML structured document

The information published in the form of XML-complaint keeps growing. They are mainly used in web-based applications and have many simultaneous interactive users. Hence there should be an efficient and effective way to optimize the XML queries. Query optimization in the context of XML database is extremely challenging as compared with the other data models. The existing optimization algorithms focus only on the containment relationships with in a XML document. This paper explains the optimization of XPath for structured Inter- documents, which make use of referencing relationship among the different XML documents. The Inter-document concept is helpful in cases where it is beneficial to have several documents. A new method of schema level query optimization for structured Inter- document is being proposed herein. The results demonstrate better scalability, selectivity and reduction in execution time.