code: func NewRtAttrChild(parent *RtAttr, attrType int, data []byte) *RtAttr {
  	return parent.AddRtAttr(attrType, data)
  }
docs: // NewRtAttrChild adds an RtAttr as a child to the parent and returns the new attribute
  //
  // Deprecated: Use AddRtAttr() on the parent object