Markup Languages
Course
PB138
Doctype definition external
<!DOCTYPE social_network SYSTEM
"social_network.dtd">
Doctype definition internal
<!DOCTYPE people
[
<!ELEMENT people ANY>
.... all elements and attributes in the doc
]>
Element types
<!ELEMENT social_network ANY>
● ANY
● EMPTY
○ <!ELEMENT phone EMPTY>
● (#PCDATA)
● elements - (phones)
Amount of elements
● (phone*)
● (phone)*
● (phone+)
● (phone, phone)*
● (street?)
● (elementA | elementB)
<!ATTLIST person
name CDATA #REQUIRED
id ID #REQUIRED>
● #REQUIRED vs #IMPLIED
● CDATA, ID, IDREF
Defining Attributes