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More of DTDs Lecture 3. Symbols used in DTD COMMA “, ” enforces sequence.

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Presentation on theme: "More of DTDs Lecture 3. Symbols used in DTD COMMA “, ” enforces sequence."— Presentation transcript:

1 More of DTDs Lecture 3

2 Symbols used in DTD COMMA “, ” enforces sequence

3 Symbols Used in DTDs The star “ * “ denotes 0 or more occerences

4 Symbols used in DTDs The plus symbol “ + “ denotes 1 or more occurrences

5 Symbols used in DTDs The star “ ? “ denotes 0 or 1 occurrence or optional appearance

6 Symbols in DTDs Vertical Bar “ | ” allows choice (OR operator)

7 Elements Containing Only Character Data ;sldjf;lakjdf;lakjskfl important gasfgsdgjdfkjdk

8 Elements Containing Only Elements Only elements:

9 Elements With Mixed Content Mixed content:

10 Attribute Data Types CDATA NMTOKEN NMTOKENS ID IDREF IDREFS

11 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

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