keyword 

The <<keyword>keyword</keyword>> element identifies a keyword
or token, such as a single value from an enumerated list, the name of a command
or parameter, or a lookup key for a message (contrast with<ph>
  <xref href="term.xml">term</xref>
</ph>).

Element Information

Model

(tm)
Children: tm

Attributes

QName Type Fixed Default Use Inheritable Annotation
audience xs:string optional
base xs:string optional
class xs:string - topic/keyword optional 
The class attribute supports specialization. Its predefined values help 
the output transforms work correctly with ranges of related content.
conref xs:string optional
id xs:NMTOKEN optional
importance importance-atts.class optional
keyref xs:string optional
otherprops xs:string optional
outputclass xs:string optional
platform xs:string optional
product xs:string optional
props xs:string optional
rev xs:string optional
status status-atts.class optional
translate yesno-att.class optional
xml:lang xs:language optional 
In due course, we should install the relevant ISO 2- and 3-letter
codes as the enumerated possible values . . .
xtrc xs:string optional
xtrf xs:string optional

Used By

Element Group keyword

Source 

<xs:element name="keyword">
  <xs:annotation>
    <xs:documentation>The <
      <keyword>keyword</keyword>> element identifies a keyword or token, such as a single value from an enumerated list, the name of a command or parameter, or a lookup key for a message (contrast with
      <ph>
        <xref href="term.xml">term</xref>
      </ph>).</xs:documentation>
  </xs:annotation>
  <xs:complexType mixed="true">
    <xs:complexContent>
      <xs:extension base="keyword.class">
        <xs:attribute ref="class" default="- topic/keyword "/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:element>

Sample