Path: utzoo!utgpu!watserv1!watmath!att!rutgers!mit-eddie!wuarchive!cs.utexas.edu!usc!ucsd!ucbvax!UICVM.UIC.EDU!CLEBER%SBU.UFRGS.ANRS.BR
From: CLEBER%SBU.UFRGS.ANRS.BR@UICVM.UIC.EDU
Newsgroups: comp.protocols.iso.dev-environ
Subject: QUESTIONS ABOUT ASN.1 TOOLS
Message-ID: <9009190506.AA16972@ucbvax.Berkeley.EDU>
Date: 18 Sep 90 23:20:00 GMT
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   I'm beginner in ISODE and i'm interested in the ASN.1 tools.
   Please, could you help me in the following questions:
   1) How does the application layer use the C structures generated by
POSY ? How does the presentation layer access the C structures for the
encoding and decoding ?
   2) Marshall Rose writed: "ASN.1 objects are represent using an internal
form called presentation element". What's a presentation element ?
Could you give me some examples  of ASN.1 objects representation ?
   3) I'dont understand very well how PEPY generates the encoder and
decoder. Are encoder and decoder generated for each ASN.1 objects (such
as SEQUENCE,INTEGER) ? Are these routines used in the presentation layer ?
   Answer to any level of details are welcome.
   Thanks in advance,
   Cleber.