By Serge Abiteboul, Peter Buneman, Dan Suciu
The internet is inflicting a revolution in how we signify, retrieve, and approach details Its development has given us a universally obtainable database-but within the type of a mostly unorganized selection of files. this is often altering, due to the simultaneous emergence of recent methods of representing information: from in the net group, XML; and from in the database neighborhood, semistructured facts. The convergence of those ways has rendered them approximately exact. Now, there's a concerted attempt to advance powerful ideas for retrieving and processing either different types of data.Data on the net is the single entire, up to date exam of those quickly evolving retrieval and processing innovations, that are of serious significance for the majority internet- and data-intensive agencies. This booklet bargains exact suggestions to a variety of useful difficulties whereas equipping you with a prepared figuring out of the basic issues-including info versions, question languages, and schemas-involved of their layout, implementation, and optimization. you can find it to be compelling studying, even if your curiosity is that of a practitioner taken with a database-driven net company or a researcher in desktop technology or comparable box. * presents an in-depth examine XML and different applied sciences for publishing dependent files at the Web.* Examines lately constructed equipment for querying and updating based net records and semistructured info, together with XML-QL and XSL.* seems to be deeper into the convergence of net and database techniques to semistructured facts presentation and querying.* info functional examples of ways those recommendations are already being applied-and how they are going to be utilized in the close to future.* Teaches sound options for writing queries over net info, describing free schemas over partly dependent info, and enforcing and optimizing queries on semistructured information.
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Extra info for Data on the Web: From Relations to Semistructured Data and XML (The Morgan Kaufmann Series in Data Management Systems)
Sample text
A DCD may be used to impose a conceptual structure to the set of articles. In particular, it may specify relationships such as subcategory or is-an-instance-of. It should be observed that our presentation covers very little of the rich typing world of DCD. It must also be said that none of this is yet a standard. 6 PARAPHERNALIA XML is only a piece (although an important one) of a much larger picture. In this section, we briefly mention three essential components of this larger picture. 1 RDF The Resource Description Framework (RDF) is a proposal for representing metadata in XML.
We now have a (rough) general picture of XML. An element may contain other elements and data. Inside an element, the ordering of subelements and pieces of data is relevant. 2 XML AND SEMISTRUCTURED DATA The basic XML syntax is perfectly suited for describing semistructured data. Recall the syntax for ssd-expressions in Chapter 2. com"}} For trees the translation from ssd-expressions to XML can be easily automated. Let us call T the translation function. 4, the translation is T(atomi cval ue) = atomi cval ue T({/1 : vl, ....
3 DOCUMENT TYPE DEFINITIONS A document type definition (DTD) serves as grammar for the underlying XML document, and it is part of the XML language. To some extent a DTD can also serve as schema for the data represented by the XML document; hence our interest here. As schema formalisms, DTDs are somewhat unsatisfactory, and several proposals have been made after the adoption of the XML standard for better schema formalisms. However, no consensus exists so far beyond the basic DTDs. com