func (r *Rule) DelAttr(key string) {
	delete(r.attrs, key)
	r.updated = true
}
func (r *Rule) DelAttr(key string) {
	delete(r.attrs, key)
	r.updated = true
}
func ( r * Rule ) DelAttr ( key string ) { delete ( r . attrs , key ) r . updated = true }
// DelAttr removes the named attribute from the rule.
DelAttr removes the named attribute from the rule .