Labeling XML Documents

Abstract

XML labeling schemes play an important role in XML query processing. Containment and Prefix labeling schemes are two of the most popular labeling schemes. In order to perform efficient XML query processing, this chapter shows how to extend the traditional prefix labeling scheme to speedup query processing. In addition, for XML documents that are updated frequently, many labeling schemes require relabeling which can be very expensive. A lot of research interest has been generated on designing dynamic XML labeling schemes. Making labeling schemes dynamic turns out to be a challenging problem and many of the approaches proposed only partially avoid relabeling. This chapter describes some recently emerged dynamic labeling schemes that can completely avoid relabeling, making efficient update processing in XML database management systems possible.