6.3 Attribute Declarations

<!ATTLIST element { name type default } ... >

data type

(value \| ... \| value)	enumerated type; one value is to be chosen

CDATA	character data

ID	unique identifier; at most one per element

IDREF	reference to an id

IDREFS	space separated list of references to ids

NMTOKEN	name token; like ID but need not be unique (e.g., class name)

NMTOKENS	separated list of name tokens

ENTITY	name of an entity

ENTITIES	space separated list of entity names

NOTATION (name \| ... \| name)	foreign data

xml:	predefined xml name

default value

"value"	assumed value, if none supplied in the document

#IMPLIED	value can be supplied but not required

#REQUIRED	value must be specified in the document

#FIXED "value"	only allowed value

<!ELEMENT person (name)+ >
<!ELEMENT name   (#PCDATA) >
<!ATTLIST person
          ssn        ID                #REQUIRED
          spouse     IDREF             #IMPLIED
          friends    IDREFS            #IMPLIED
          profession NMTOKEN           "student"
          employer   CDATA             #FIXED     "osu"  >
<!ATTLIST name type (first | middle | last) #IMPLIED  >

<person ssn="n123456789" employer="osu" >
  <name>Me</name>
  <name type="first">Alone</name>
</person>
<person ssn="n012345678" employer="osu" >
  <name>You</name>
  <name type="first">Fun</name>
</person>
<person ssn="n987654321"
        spouse="n123456789"
        friends="n123456789 n012345678"
        employer="osu" >
  <name type="first">One</name>
  <name>Some</name>
</person>

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