In the previous parts we compared the relational data model with the XML data model and argued that a new breed of XML enabled data sources, such as Software AGs Tamino - The Power Database for the Internet, is required to meet the demands of the new data model. At present, XQL has the status of a proposal to the W3C, but is not yet a W3C recommendation. Although the proposal is considered as quite stable, please keep in mind that features presented in this article can differ from the final W3C recommendation.
Documents have a tree-like structure.
Document elements can nest. Multiple elements with identical tags are allowed in a document. Sequence and position counts. In the next part we're going to illustrate these.