where <ftag> is the feature’s tag (an identifier of your choice), and 
ftype is the feature’s type. Feature types are capitalized and case-sensitive (for example, 
FreeTet).
 
    When you add a feature, it is inserted after the current feature. You can get the tag of the current feature type by entering
 
    If ftag is the empty string, the current feature is the beginning of the meshing sequence, that is, the empty state before all features. Adding a meshing feature, it automatically becomes current, but it is not built automatically.
 
    where <ftag1> is the attribute feature’s tag (an identifier of your choice), and 
ftype is the attribute feature’s type.