Based on the analysis of the main elements of environmental management system, their interaction and inquirement way of related documents, the requirement of 4.

Now that the diversity of bill crimes, the investigation approach also has different kinds, mainly guided by bills and the flow of the money.

Efficient path query processing is a key requirement for advanced applications including GIS (Geographic Information Systems), navigation systems, and computer networks.

Aiming at the problem that the response time of illegal path query is too long, this paper proposes a new indexing method which proceeds pretreatment with DTD schema of XML document.