
34 Foundations of Semantic Web Technologies
Namespace declaration Usage: namespace:name in XML element names
Declaration: xml:namespace="<uri>" in XML
start tags or empty-element tags; declarations af-
fect XML subtree; multiple declarations possible
Entity declaration Usage: &entity; in XML attribute values or char-
acter content (RDF literal values) of elements
Declaration: <!ENTITY entity 'text'> in initial
DOCTYPE declaration; declaration affects whole
document; only one declaration possible
Predefined entities Usage: <, >, &, ', or " in
XML attribute values or character content (RDF
literal values) of elements
Declaration: predefined ...