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Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
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III Object Based Databases and XML
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10 XML
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The McGraw Hill Companies, 2001
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XML documents However, XSLT offers quite powerful querying and transformation features and is widely available, so it is used for quering XML data
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XSLT programs contain a series of templates, each with a match part and a select part Each element in the input XML data is matched against available templates, and the select part of the rst matching template is applied to the element Templates can be applied recursively, from within the body of another template, a procedure known as structural recursion XSLT supports keys, which can be used to implement some types of joins It also supports sorting and other querying facilities The XQuery language, which is currently being standardized, is based on the Quilt query language The XQuery language is similar to SQL, with for, let, where, and return clauses However, it supports many extensions to deal with the tree nature of XML and to allow for the transformation of XML documents into other documents with a signi cantly different structure XML data can be stored in any of several different ways For example, XML data can be stored as strings in a relational database Alternatively, relations can represent XML data as trees As another alternative, XML data can be mapped to relations in the same way that E-R schemas are mapped to relational schemas XML data may also be stored in le systems, or in XML-databases, which use XML as their internal representation The ability to transform documents in languages such as XSLT and XQuery is a key to the use of XML in mediation applications, such as electronic business exchanges and the extraction and combination of Web data for use by a personal nance manager or comparison shopper
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Extensible Markup Language (XML) Hyper-Text Markup Language (HTML) Standard Generalized Markup Language Markup language Tags Self-documenting Element Root element ID IDREF and IDREFS Tree model of XML data Nested elements Attribute Namespace Default namespace Schema de nition Document Type De nition (DTD) XMLSchema
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Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
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III Object Based Databases and XML
10 XML
The McGraw Hill Companies, 2001
10
Nodes Querying and transformation Path expressions XPath Style sheet XML Style sheet Language (XSL) XSL Transformations (XSLT) Templates Match Select Structural recursion Keys Sorting XQuery
FLWR expressions
Joins Nested FLWR expression Sorting XML API Document Object Model (DOM) Simple API for XML (SAX) Storage of XML data In relational databases Store as string Tree representation Map to relations In nonrelational data stores Files XML-databases XML Applications Exchange of data Publish and shred Data mediation Wrapper software XML-Enabled database
for let where return
Exercises
101 Give an alternative representation of bank information containing the same data as in Figure 101, but using attributes instead of subelements Also give the DTD for this representation 102 Show, by giving a DTD, how to represent the books nested-relation from Section 91, using XML 103 Give the DTD for an XML representation of the following nested-relational schema Emp = (ename, ChildrenSet setof(Children), SkillsSet setof(Skills)) Children = (name, Birthday) Birthday = (day, month, year) Skills = (type, ExamsSet setof(Exams)) Exams = (year, city) 104 Write the following queries in XQuery, assuming the DTD from Exercise 103 a Find the names of all employees who have a child who has a birthday in March b Find those employees who took an examination for the skill type typing in the city Dayton c List all skill types in Emp
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
III Object Based Databases and XML
10 XML
The McGraw Hill Companies, 2001
Exercises
<!DOCTYPE bibliography [ <!ELEMENT book (title, author+, year, publisher, place )> <!ELEMENT article (title, author+, journal, year, number, volume, pages )> <!ELEMENT author ( last-name, rst-name) > <!ELEMENT title ( #PCDATA )> similar PCDATA declarations for year, publisher, place, journal, year, number, volume, pages, last-name and rst-name ]> Figure 1013
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