ADOApplicationLibraryNew.addRecordClass(RecordClass) is private

The method private ADOApplicationLibraryNew addRecordClass(RecordClass recordClass) is specified as private, but weirdly the Attribute Profile version public ADOApplicationLibraryNew addAttrProf(AttrProf attrProf) is public, even though RecordClass and AttrProf they seem to have the same structure:

private Identifier identifier = null;
private Identifier superClassIdentifier = null;
private ArrayList<Attribute> attributeList = new ArrayList<Attribute>();

Is there a specific reason for this difference?