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<!doctype chapter PUBLIC "-//Stork//DTD chapter//EN">
<!--
``The contents of this file are subject to the Erlang Public License,
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Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
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$Id$
-->
<chapter>
<header>
<title>ASN1 Release Notes</title>
<prepared>Kenneth Lundin</prepared>
<responsible>Kenneth Lundin</responsible>
<docno></docno>
<approved>Kenneth Lundin</approved>
<checked>Kenneth Lundin</checked>
<date>97-10-07</date>
<rev>A</rev>
<file>notes_latest.sgml</file>
</header>
<p>This document describes the changes made to the asn1 application.
<section>
<title>ASN1 0.8.1</title>
<p>This is the first release of the ASN1 application. This version is released
for beta-testing. Some functionality will be added until the 1.0 version is
released. A list of missing features and restrictions can be found in the
chapter below.
<section>
<title>Missing features and other restrictions</title>
<list>
<item>
<p>The encoding rules BER and PER (aligned) is supported. <em>PER (unaligned)
IS NOT SUPPORTED</em>.
<item>
<p>NOT SUPPORTED types <c>ANY</c> and <c>ANY DEFINED BY</c>
(is not in the standard any more).
<item>
<p>NOT SUPPORTED types <c>EXTERNAL</c> and <c>EMBEDDED-PDV</c>.
<item>
<p>NOT SUPPORTED type <c>REAL</c> (planned to be implemented).
<item>
<p>The code generation support for value definitions in the ASN.1 notation is very limited
(planned to be enhanced).
<item>
<p>The support for constraints is limited to:
<list>
<item><p>
SizeConstraint SIZE(X)
<item><p>
SingleValue (1)
<item><p>
ValueRange (X..Y)
<item><p>
PermittedAlpabet FROM (but not for BMPString and UniversalString when generating PER).
</list>
<p>Complex expressions in constraints is not supported (planned to be extended).
<item>
<p>The current version of the compiler has very limited error checking:
<list>
<item><p>Stops at first syntax error.
<item><p>Does not stop when a reference to an undefined type is found ,
but prints an error message. Compilation of the generated
Erlang module will then fail.
<item><p>A whole number of other semantical controls is currently missing. This
means that the compiler will give little or bad help to detect what's wrong
with an ASN.1 specification, but will mostly work very well when the
ASN.1 specification is correct.
</list>
<item>
<p>The maximum INTEGER supported in this version is a signed 64 bit integer. This
limitation is probably quite reasonable. (Planned to be extended).
<item>
<p>Only AUTOMATIC TAGS supported for PER.
<item>
<p>Only EXPLICIT and IMPLICIT TAGS supported for BER.
<item>
<p>The compiler supports decoding of BER-data with indefinite length but it is
not possible to produce data with indefinite length with the encoder.
</list>
</section>
</section>
</chapter>
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