fDecl

<fDecl>

<fDecl> (feature declaration) declares a single feature, specifying its name, organization, range of allowed values, and optionally its default value. 18.11 Feature System Declaration

Module

iso-fs — 18 Feature Structures

Attributes

In addition to global attributes

name

indicates the name of the feature being declared; matches the name attribute of f elements in the text.

Status	Required
Datatype	<rng:ref name="data.name"/> data.name
Values	any string of characters

optional

indicates whether or not the value of this feature may be present.

Status	Optional
Datatype	<rng:data type="boolean"/> xsd:boolean
Note	If a feature is marked as optional, it is possible for it to be omitted from a feature structure. If an obligatory feature is omitted, then it is understood to have a default value, either explicitly declared, or, if no default is supplied, the special value any. If an optional feature is omitted, then it is understood to be missing and any possible value (including the default) is ignored.

Declaration

<rng:element name="fDecl">
 <rng:ref name="att.global.attributes"/>
 <rng:attribute name="name">
  <rng:ref name="data.name"/>
 </rng:attribute>
 <rng:optional>
  <rng:attribute name="optional" defaultValue="true">
   <rng:data type="boolean"/>
  </rng:attribute>
 </rng:optional>
 <rng:group>
  <rng:optional>
   <rng:ref name="fDescr"/>
  </rng:optional>
  <rng:ref name="vRange"/>
  <rng:optional>
   <rng:ref name="vDefault"/>
  </rng:optional>
 </rng:group>
</rng:element>

element fDecl
{
   att.global.attributes,
   attribute name { data.name },
   attribute optional { xsd:boolean }?,
   ( fDescr?, vRange, vDefault? )
}

Contained by

fsDecl

May contain

iso-fs: fDescr vDefault vRange

P5: Guidelines for Electronic Text Encoding and Interchange

<fDecl>