At present, XML language has been regarded as a standard of data exchange due to such attributes as being unrelevant to platform, auto-description of itself, easy extention, separation of content and form, and so on. Therefore, in the course of study of share of heterogeneous-data in coal enterprises, we design a heterogeneous-data query system based on XML to provide a unified data integration platform and share of information resource with high quality and speed, which will solve a problem with information islands produced in coal enterprises.
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