By Serge Abiteboul, Peter Buneman, Dan Suciu
Filenote: PDF is searchable snapshot ocr with front/back conceal. Bookmarked TOC. PDF is 260 pages
Publish yr note: First released October twelfth 1999
The net is inflicting a revolution in how we characterize, retrieve, and strategy info Its progress has given us a universally obtainable database yet within the kind of a mostly unorganized number of files. this can be altering, because of the simultaneous emergence of latest methods of representing info: from in the internet group, XML; and from in the database group, semistructured info. The convergence of those techniques has rendered them approximately exact. Now, there's a concerted attempt to advance potent strategies for retrieving and processing either types of data.
Data at the Web" is the one complete, up to date exam of those swiftly evolving retrieval and processing innovations, that are of serious value for the majority net- and data-intensive businesses. This booklet bargains designated suggestions to quite a lot of useful difficulties whereas equipping you with a prepared knowing of the elemental matters together with facts versions, question languages, and schemas serious about their layout, implementation, and optimization.
You'll locate it to be compelling analyzing, no matter if your curiosity is that of a practitioner concerned about a database-driven internet company or a researcher in computing device technology or comparable field.
* presents an in-depth examine XML and different applied sciences for publishing established files at the Web.
* Examines lately built equipment for querying and updating dependent internet records and semistructured facts, together with XML-QL and XSL.
* seems deeper into the convergence of internet and database techniques to semistructured facts presentation and querying.
* information sensible examples of ways those options are already being utilized and the way they are going to be utilized in the close to future.
* Teaches sound concepts for writing queries over internet information, describing free schemas over in part based information, and imposing and optimizing queries on semistructured data."
Read or Download Data on the Web: From Relations to Semistructured Data and XML PDF
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Additional resources for Data on the Web: From Relations to Semistructured Data and XML
In this chapter, we shall introduce the syntax of a simple core language for semistructured data and then describe two extensions that have resulted in working prototypes. The development of query languages for semistructured data, and in particular for XML, is very much in its infancy, and it is anyone's guess as to what will emerge as a standard. The two languages we shall describe here, Lorel and UnQL, are very similar in expressive power. They are presented in this fashion so that the reader should be able to appreciate that there is not a huge difference between query languages based on a database standard query language such as OQL and those, like XSL and XML-QL, that are based on pattern matching on the syntax of the underlying data format.
Such information may be included separately in a stylesheet. Stylesheets in a specification language called XSL (eXtensible Stylesheet Language) are used to translate XML data to HTML. The resulting HTML pages can then be displayed by standard browsers. XSL will be described in Chapter 5. In its basic form, XML is simply a syntax for transmitting data, much in the spirit of the syntax described in Chapter 2. As such, it is likely to become a major standard for data exchange on the Web. For an organization or a group of users, XML allows a specification that facilitates data exchange and reuse by multiple applications.
If the user clicks on this anchor, a pop-up menu appears with an alternative between visa and kleebox, the two accepted forms of payment. The choice of one triggers the inclusion of the appropriate form. The linking process is quite rich. Indeed, a link between an element in a document d, and a document d 2 may be defined externally to both d, and d 2 . Thus, we may link a document to others without actually modifying it. XLink also allows us to create links that have several targets. XLink and Xpointer are not yet fully standardized.