Web data management
Download as PPTX, PDF0 likes403 views
The document discusses web data management, focusing on various data models, including semistructured data and XML, which is presented as a standard for data exchange on the web. It outlines the components of XML, such as SAX, DOM, XPath, XQuery, and XSLT, which facilitate the processing and transformation of XML documents. Additionally, it highlights web services that enable interoperability between machines using web protocols.
Web data management
- 1. Web Data Management Abdul Hannan 131371 Sumain Shahid 131359
- 2. Data Model • Types of Systems - B2B - B2C - G2B - G2C
- 3. Introducing XML • In computing, Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.
- 4. Semistructured data • A semistructured data model is based on an organization of data in labeled trees (possibly graphs). • The labels capture the structural information. Directed and Undirected
- 5. Semistructured data (Cont) • We next present informally a standard semistructured data model. {name: "Alan", tel: 2157786, email: "[email protected]"} {name: {first: "Alan", last: "Black"}, tel: 2157786, email: "[email protected]"}
- 7. XML (Extensible Markup Language) • XML, the Extensible Markup Language, is a semistructured data model that has been proposed as the standard for data exchange on the Web. It is a simplified version of SGML (Standard Generalized Markup Language). XML meets the requirements of a flexible, generic, and platform-independent language, as presented earlier. • XML documents Labeled Unranked Ordered
- 9. Serialized and tree-based forms • Serialized forms, which are textual, linear representations of the tree. • Tree-based forms, which implement, in a specific context
- 10. Data Exchange • The typical flow of information during XML-based data exchange • Application A manages some internal data, using some specialized data management software. Exchanging these data with another application B can be motivated either for publication purposes, or for requiring from B some specialized data processing.
- 11. Extensible Stylesheet Language Transformations
- 12. Standards • SAX, the Simple API for XML, is an application programming interface (API) providing a serial access to XML documents seen as a sequence of tokens (its serialization). • DOM, the Document Object Model, is an object-oriented model for representing (HTML and) XML document, independently from the programming language. DOM sees a document as a tree and provides some navigation in it (e.g., move to parent, first child, left/right sibling of a node). A DOM API is available for all popular languages (Java, C++, C#, Javascript, etc.) • XPath, the XML Path Language, is a language for addressing portions of an XML document. • XQuery is a flexible query language for extracting information from collections of XML documents. It is to a certain extent the SQL for Web data. • XSLT, the Extensible Stylesheet Language Transformations, is a language for specifying the transformation of XML documents into other XML documents. A main usage of XSLT is to define stylesheet to transform some XML document into XHTML, so that it can be displayed as aWeb page. • Web services, provide interoperability between machines based onWeb protocols. See further.