<forest>

<forest> provides for groups of rooted trees. 19.3 Another Tree Notation
組件nets — 19 Graphs, Networks, and Trees
屬性
typeidentifies the type of the forest.
狀態 非必備的
資料類型 
data.enumerated
值 A character string.
屬於forestGrp model.divPart
可包含
nets: eTree tree triangle
宣告
element forest
{
   att.global.attributes,
   attribute type { data.enumerated }?,
   ( tree | eTree | triangle )+
}
註
One or more trees, embedding trees, or underspecified embedding trees (triangles).