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Definition

Document Type Definition. Describes rules for checking if an [[XML]] document is well-formed/valid.

Example Description
<!DOCTYPE name [...]> Declares the root node as being the element name
<!ELEMENT name (TYPE)> Declare a type of element called name that has type TYPE
<!ELEMENT parent (child1, child2)> Declares an element type parent, which always has children child1 and child2
#PCDATA The type for parsed character data (strings)

Examples

Notes

<?XML version = “1.0”?>
<!DOCTYPE note[
	<!Element note(to,from,heading,notebody)>
	<!Element to(#PCDATA)>
	<!Element from(#PCDATA)>
	<!Element heading(#PCDATA)>
	<!Element notebody(#PCDATA)> 
]>

<note>
	<to>CS 731</to>
	<from>21456687</from>
	<heading>presentation</heading>
	<notebody>XML introduction</notebody>
</note>
  • PCDATA is parsed character data / strings