From Semistructured Data to XML: Migrating the Lore Data Model and Query Language

摘要: Research on semistructured data over the last several years has focused models, query languages, and systems where database is modeled as some form of labeled, directed graph. The recent emergence eXtensible Markup Language (XML) a new standard for representation exchange World-Wide Web drawn significant attention. Researchers have casually observed striking similarity between models XML. While similarities do abound, key differences dictate changes to any existing model, language, or DBMS in order fully support This paper describes our experiences migrating Lore management system work with We present modified whose definition was subtly challenging task given that XML itself just textual language. Based this we describe Lorel, Lore's also briefly discuss dynamic structural summaries (DataGuides) relationship DataGuides XML's Document Type Definitions (DTDs).