a) You will create a DTD from scratch. Write the correct DTD declaration for eac

Question

a) You will create a DTD from scratch. Write the correct DTD declaration for each of the following descriptions. (Your answers should NOT be XML elements!) Declare an element e which has string content: Declare an element d which cannot have any content: Declare an element c which contains precisely one e followed by possibly one d: Declare an element b which has mixed content, namely strings mixed with any number of e elements: Declare an element a whose content will be a choice between a sequence of (one or more c, then one d, then 0 or more e, then one b) and a sequence of (one b, then one d, then one c): b) Write a minimal XML document that would validate against the DTD from question a).

Explanation / Answer

Element with no content

<!ELEMENT element-name EMPTY>

Example:

<!ELEMENT br EMPTY>

XML example:

In this example address is declared as an empty element. The markup for address element would appear as <address />

Declaring Mixed Content

<!ELEMENT note (#PCDATA|to|from|header|message)*>

or <!ELEMENT elementname (#PCDATA|child1|child2)*>

for example

Element with string content

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