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More of DTDs Lecture 3
Symbols used in DTD COMMA “, ” enforces sequence
Symbols Used in DTDs The star “ * “ denotes 0 or more occerences
Symbols used in DTDs The plus symbol “ + “ denotes 1 or more occurrences
Symbols used in DTDs The star “ ? “ denotes 0 or 1 occurrence or optional appearance
Symbols in DTDs Vertical Bar “ | ” allows choice (OR operator)
Elements Containing Only Character Data ;sldjf;lakjdf;lakjskfl important gasfgsdgjdfkjdk
Elements Containing Only Elements Only elements:
Elements With Mixed Content Mixed content:
Attribute Data Types CDATA NMTOKEN NMTOKENS ID IDREF IDREFS
Attribute Declaration Example <!ATTLIST memo idID#REQUIRED security(high|low) “high” keywords NMTOKENS #IMPLIED > IMPLIED means it the attribute is optional and has no default value
Defining XML The Document Type Definition. Document Type Definition text syntax for defining –elements of XML –attributes (and possibly default values)
17 Apr 2002 XML Syntax: DTDs Andy Clark. Validation of XML Documents XML documents must be well-formed XML documents may be valid – Validation verifies.
1 DTD (Document Type Definition) Imposing Structure on XML Documents (W3Schools on DTDs)W3Schools on DTDs.
XML 6.3 DTD 6. XML and DTDs A DTD (Document Type Definition) describes the structure of one or more XML documents. Specifically, a DTD describes: Elements.
XML Document Type Definitions ( DTD ). 1.Introduction to DTD An XML document may have an optional DTD, which defines the document’s grammar. Since the.
DTDs : definitions. Defining Elements PCDATA: Parsed character data i.e., any characters without further XML structure.
Introduction to XML: DTD
XML Language Family Detailed Examples Most information contained in these slide comes from: These slides are intended.
Document Type Definition DTDs CS-328. What is a DTD Defines the structure of an XML document Only the elements defined in a DTD can be used in an XML.
Document Type Definitions
1 XML: Document Type Definitions 2 Road Map Introduction to DTDs What’s a DTD? Why are they important? What will we cover? Our First DTD
A Technical Introduction to XML Transparency No. 1 XML quick References.
2002 Prentice Hall, Inc. All rights reserved. ISQA 407 XML/WML Winter 2002 Dr. Sergio Davalos.
Full declaration When an element is declared to have element content, the children element types must also be declared Example: to which the following.
Physical and Logical Structure
Declare A DTD File. Declare A DTD Inline File For example, use DTD to restrict the value of an XML document to contain only character data.
4/16/2007Declare a Schema File I1. 4/16/2007Declare a Schema File I2 Declare a Schema File A collection of semantic validation rules designed to constrain.
1 Print your own copy If you bring it along, hand in with your exam script Do not write anything extra or you will be penalized Student Name: Student Number:
XML Verification Well-formed XML document conforms to basic XML syntax contains only built-in character entities Validated XML document conforms.
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