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| DTD Example: <!ELEMENT br EMPTY> |
In XML document:
<br />
Elements with Parsed Character Data
Elements with only parsed character data are
declared with #PCDATA inside the
parentheses:
<!ELEMENT element-name (#PCDATA)> |
DTD Example:
<!ELEMENT To (#PCDATA)>
<!ELEMENT From (#PCDATA)> |
Elements with Data
Elements declared with the keyword ANY, can
contain any combination of parsable data:
| <!ELEMENT element-name ANY> |
DTD Example:
<!ELEMENT E-mail (To,From,Subject,Body)>
<!ELEMENT To (#PCDATA)>
<!ELEMENT From (#PCDATA)>
Elements with Children (sequences)
Elements with one or more children are
declared with the name of the children
elements inside the parentheses as:
<!ELEMENT element-name (child1)>
or
<!ELEMENT element-name (child1,child2,...)> |
DTD Example:
| <!ELEMENT E-mail (To,From,Subject,Body)> |
When children are declared in a sequence
separated by commas, the children must
appear in the same sequence in the
document. In a full declaration, the children
must also be declared.Children can have |
|
children. The full declaration of the “E-mail”
element is:
<!ELEMENT E-mail (To,From,Subject,Body)>
<!ELEMENT To (#PCDATA)>
<!ELEMENT From (#PCDATA)>
<!ELEMENT Subject (#PCDATA)>
<!ELEMENT Body (#PCDATA)> |
Declaring Only One Occurrence of an Element
| <!ELEMENT element-name (child-name)> |
DTD Example:
| <!ELEMENT color (Fill-Red)> |
The example above declares that the child
element “Fill-Red” must occur once, and only
once inside the “color” element.
Declaring Minimum One Occurrence of an
Element
| <!ELEMENT element-name (child-name+)> |
DTD Example:
| <!ELEMENT color (Fill-Red+)> |
The ‘+’ sign in the example above declares
that the child element “Fill-Red” must occur
one or more times inside the “color” element.
Declaring Zero or More Occurrences of an
Element
| <!ELEMENT element-name (childname*)> |
DTD Example:
| <!ELEMENT color (Fill-Red*)> |
The ‘*’ sign in the example above declares
that the child element “Fill-Red” can occur
zero or more times inside the “color” element.
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Jan
2008 | Java Jazz Up |32 |
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| All Pages of this Issue |
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