}

// IsCompact reports whether this tag is fully defined in terms of ID.
func (t *Tag) IsCompact() bool {
	return t.full == nil
}

// MayHaveVariants reports whether a tag may have variants. If it returns false
// it is guaranteed the tag does not have variants.
func (t Tag) MayHaveVariants() bool {
	return t.full != nil || int(t.language) >= len(coreTags)
}

// MayHaveExtensions reports whether a tag may have extensions. If it returns

}

// Variants returns the variants specified explicitly for this language tag.
// or nil if no variant was specified.
func (t Tag) Variants() []Variant {
	if !compact.Tag(t).MayHaveVariants() {
		return nil
	}
	v := []Variant{}
	x, str := "", t.tag().Variants()
	for str != "" {
		x, str = nextToken(str)
		v = append(v, Variant{x})
	}
	return v
}