[ASN.1] the inheritance problem about information object class of ASN.1

[Rajul Gupta]

Dear Chuchun,   Are you talking about mhs-distribution-list, mhs-message-store in this specification? These are Information Objects of OBJECT-CLASS Information Object Class, not the extended classes of OBJECT-CLASS. Author of this document has used user-friendly syntax like SUBCLASS OF, MUST CONTAIN, MAY CONTAIN so that these look like sub-classes of OBJECT-CLASS; these are not the keywords of ASN.1. Basically, the author of this document has very smartly used Information Object Classes to simulate inheritance. So, I guess, I was wrong, you can really simulate inheritance like this. :)   Rajul     ------------------------------------------------------------------------- Hi   I found that information object class supported inheritance in Module MHSDirectoryObjectsAndAttributes (X.402:06/1999) (http://www.itu.int/ITU-T/asn1/database/itu-t/x/x402/1999/MHSDirectoryObjectsAndAttributes.html)who can interpret that to me,thank you. ======= 2002-09-30 22:40:00 您在来信中写道：======= >Hi, > >Information Object Classes are not exactly like the classes of object >oriented languages. These don't support inheritance, or any static members. >However, you can define functions using information object classes (This >also is not like methods in C++ or Java classes) > >For example, > >FUNCTION ::= CLASS { >    &Type, >    &ResultType    DEFAULT NULL, >    &code          INTEGER UNIQUE >} > >Then you can have information objects of above class just like functions. > >add FUNCTION ::= { >    &Type SEQUENCE { first INTEGER, second INTEGER }, >    &ResultType INTEGER, >    &code       1 >} > >multiply FUNCTION ::= { >    &Type SEQUENCE { first INTEGER, second INTEGER }, >    &ResultType INTEGER, >    &code       2 >} > >.... >.... > >You can get more information about this from lot of places on the web. >www.oss.com has two ASN.1 books available for free download, which contain >very good info about Information Object Classes. > >Rajul > >----- Original Message ----- >From: "chuchun" <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >Sent: Friday, September 27, 2002 9:11 PM >Subject: [ASN.1] the problem about information object class of ASN.1 > > >> I want to define object with ASN.1,but I am not sure whether information >object class can define object oriented.say,can information object class >show inheritance and contain static property and function? Thank you . >> >> 　　　　　　　　chuchun >> 　　　　　　　　[EMAIL PROTECTED] >> 　　　　　　　　　　2002-09-28 >> >> >> >> >> = = = = = = = = = = = = = = = = = = = = 　　　　　　　　致 礼！   　　　　　　　　chuchun 　　　　　　　　[EMAIL PROTECTED] 　　　　　　　　　　2002-10-08 Rajul Gupta OSS Nokalva [EMAIL PROTECTED] 1-732-302-9669 (x-137) http://www.oss.com