Lazy query evaluation for Active XML

摘要: In this paper, we study query evaluation on Active XML documents (AXML for short), a new generation of that has recently gained popularity. AXML are whose content is given partly extensionally, by explicit data elements, and intensionally, embedded calls to Web services, which can be invoked generate data.A major challenge in the efficient queries over such detect may bring relevant execution, avoid materialization irrelevant information. The problem intricate, as service anywhere document, invocations possibly return containing services. Hence, detection becomes continuous process. Also, good analysis must take signatures into consideration.We formalize problem, provide algorithms solve it. We also present an implementation compliant with services standards, used part ActiveXML system. Finally, experimentally measure performance gains obtained careful filtering triggered.