Introduction Syntax and Usage XML Databases Java Tutorial XML. November 5, 2008 XML

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1 Introduction Syntax and Usage Databases Java Tutorial November 5, 2008

2 Introduction Syntax and Usage Databases Java Tutorial Outline 1 Introduction 2 Syntax and Usage Syntax Well Formed and Valid Displaying on Web Parsing 3 Databases 4 Java Tutorial

3 Introduction Syntax and Usage Databases Java Tutorial Attributes vs. Elements Type of information Essential element Peripheral, supportive attribute

4 Introduction Syntax and Usage Databases Java Tutorial Attributes vs. Elements Type of information Essential element Peripheral, supportive attribute Extensiblity Atomic attribute Extensible, structured element

5 Introduction Syntax and Usage Databases Java Tutorial Attributes vs. Elements Type of information Essential element Peripheral, supportive attribute Extensiblity Atomic attribute Extensible, structured element Readability Human readable element Computer processing only attribute

6 Introduction Syntax and Usage Databases Java Tutorial Well-Formed that conforms to the syntax rules root element closing tags (or empty element) case sensitiveness proper nesting attribute values are quoted Conforming parser will give an error

7 Introduction Syntax and Usage Databases Java Tutorial Valid Has to be well-formed and obey some semantic rules (grammar) User-defined restrict element & attribute names and hierarchies in schema DTD Schema (W3C)

8 Introduction Syntax and Usage Databases Java Tutorial document for AddressBook <?xml version="1.0"?> <addressbook> <person> <name> <firstname>brett</firstname> <lastname>mclaughlin</lastname> </name> < < </person> <person> <name> <firstname>eddie</firstname> <lastname>balucci</lastname> </name> < < </person> </addressbook>

9 Introduction Syntax and Usage Databases Java Tutorial DTD Schema Element Declaration: <!ELEMENT person (name, )> <!ELEMENT (#PCDATA)> Specifying number of elements *: zero or more ?: zero or one +: one or more Attributes declaration: <!ATTLIST type CDATA "work">

10 Introduction Syntax and Usage Databases Java Tutorial Document Type Definition Declare the schema in document <!DOCTYPE addressbook SYSTEM "addbook_schema.dtd"> Define schema in separate file <!ELEMENT addressbook (person+)> <!ELEMENT person (name, +)> <!ELEMENT name (firstname, lastname)> <!ELEMENT firstname (#PCDATA)> <!ELEMENT lastname (#PCDATA)> <!ELEMENT (#PCDATA)> <!ATTLIST type CDATA "work">

11 Introduction Syntax and Usage Databases Java Tutorial Schema schema In as well More powerful Specify in a.xsd file

12 Introduction Syntax and Usage Databases Java Tutorial Document with Schema reference <Addressbook xmlns=" xmlns:xsi=" xsi:schemalocation="

13 Introduction Syntax and Usage Databases Java Tutorial Schema schema <?xml version="1.0" encoding="utf-8"?> <xs:schema xmlns:xs=" <xs:element name="addressbook"> <xs:complextype> <xs:sequence> <xs:element name="name" minoccurs="1" maxoccurs="1"> <xs:complextype> <xs:sequence> <xs:element name="firstname" type="xs:string" minoccurs="1" maxocc <xs:element name="lastname" type="xs:string" minoccurs="0" maxoccu </xs:sequence> </xs:complextype> </xs:element> <xs:element name=" " type="xs:string"> <xs:attribute name="isbn" type="xs:string"/> </xs:element> </xs:sequence> </xs:complextype> </xs:element> </xs:schema>

14 Introduction Syntax and Usage Databases Java Tutorial Viewing in Browsers display works in most browsers Will check well-formedness Can use CSS files for styling Also XSLT styling Other outputs: CSV, PDF, SVG

XML extensible Markup Language

XML extensible Markup Language extensible Markup Language Eshcar Hillel Sources: http://www.w3schools.com http://java.sun.com/webservices/jaxp/ learning/tutorial/index.html Tutorial Outline What is? syntax rules Schema Document Object