code: StructTypeID findStruct(String name) {
      // walk through the list, searching. Not the most efficient way, but this
      // in intended to be used rarely, so we keep it simple. 
      // As an optimization, we can keep a hashmap of record name to its RTI, for later.
      for (FieldTypeInfo ti : typeInfos) {
        if ((0 == ti.getFieldID().compareTo(name)) && (ti.getTypeID().getTypeVal() == RIOType.STRUCT)) {
          return (StructTypeID) ti.getTypeID();
        }
      }
      return null;
    }
docs: /*
  return the StructTypeiD, if any, of the given field