This tutorial introduces SPARQL and the data formats it is based on. It also covers the RDF, RDF Schema, OWL, and Turtle knowledge representation languages. With these languages, you build ontologies or domain models. For the example used throu

U810.1数据字典查询U8数据结构，便于开发数据库程序(The U810.1 data dictionary queries the U8 data structure)