Tree domain with class and type features and its application in XML documents

We discussed carefully about the conceptions on tree domain with class and type features under the background of XML. In the paper, not only the names but also types of each node in tree domain are taken into account. When considering the names, due to different classes of names, we introduced tree skeleton. And when considering the types, we introduced branch types. On the basis of these, we further discussed the relationship among the branch names and types. The conceptions studied in the paper are useful in the research on XML documents storage, transformation and parsing.