<fDecl>

<fDecl> (素性宣言) 要素fに対応する素性を宣言する．例えば，名前，データ構 造，定義域，既定値など． 18.11 Feature System Declaration
モジュールiso-fs — 18 Feature Structures
属性
name当該素性の名前を示す．
状態 必須
データ型 
data.name
値 any string of characters
optionalindicates whether or not the value of this feature may be present.
状態 任意
データ型 
xsd:boolean
解説
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.
当該モジュールを使用するものfsDecl
下位
iso-fs: fDescr vDefault vRange
宣言
element fDecl
{
   att.global.attributes,
   attribute name { data.name },
   attribute optional { xsd:boolean }?,
   ( fDescr?, vRange, vDefault? )
}