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+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE chapter SYSTEM "chapter.dtd">
+
+<chapter>
+ <header>
+ <copyright>
+ <year>1997</year><year>2013</year>
+ <holder>Ericsson AB. All Rights Reserved.</holder>
+ </copyright>
+ <legalnotice>
+ The contents of this file are subject to the Erlang Public License,
+ Version 1.1, (the "License"); you may not use this file except in
+ compliance with the License. You should have received a copy of the
+ Erlang Public License along with this software. If not, it can be
+ retrieved online at http://www.erlang.org/.
+
+ Software distributed under the License is distributed on an "AS IS"
+ basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ the License for the specific language governing rights and limitations
+ under the License.
+
+ </legalnotice>
+
+ <title>Introduction</title>
+ <prepared></prepared>
+ <docno></docno>
+ <date>2015-03-31</date>
+ <rev>A</rev>
+ <file>asn1_introduction.xml</file>
+ </header>
+
+ <p>The <c>ASN.1</c> application provides the following:</p>
+
+ <list type="bulleted">
+ <item>An ASN.1 compiler for Erlang, which generates encode and
+ decode functions to be used by Erlang programs sending and
+ receiving ASN.1 specified data.</item>
+ <item>Runtime functions used by the generated code.</item>
+ <item>Support for the following encoding rules:
+ <list><item>Basic Encoding Rules (BER)</item>
+ <item>Distinguished Encoding Rules (DER), a specialized form of
+ BER that is used in security-conscious applications</item>
+ <item>Packed Encoding Rules (PER), both the aligned and
+ unaligned variant</item>
+ </list>
+ </item>
+ </list>
+
+ <section>
+ <title>Scope</title>
+ <p>This application covers all features of ASN.1 up to the 1997
+ edition of the specification. In the 2002 edition,
+ new features were introduced. The following features
+ of the 2002 edition are fully or partly supported:</p>
+ <list type="bulleted">
+ <item>
+ <p>Decimal notation (for example, <c>"1.5e3</c>) for REAL values.
+ The NR1, NR2, and NR3 formats as explained in ISO 6093 are
+ supported.</p>
+ </item>
+ <item>
+ <p>The <c>RELATIVE-OID</c> type for relative object identifiers is
+ fully supported.</p>
+ </item>
+ <item>
+ <p>The subtype constraint (<c>CONTAINING</c>/<c>ENCODED BY</c>) to
+ constrain the content of an octet string or a bit string is
+ parsed when compiling, but no further action is taken. This
+ constraint is not a PER-visible constraint.</p>
+ </item>
+ <item>
+ <p>The subtype constraint by regular expressions (<c>PATTERN</c>)
+ for character string types is parsed when compiling, but no
+ further action is taken. This constraint is not a
+ PER-visible constraint.</p>
+ </item>
+ <item>
+ <p>Multiple-line comments as in C, <c>/* ... */</c>, are
+ supported.</p>
+ </item>
+ </list>
+ </section>
+
+ <section>
+ <title>Prerequisites</title>
+ <p>It is assumed that the reader is familiar with the Erlang
+ programming language, concepts of OTP, and is familiar with the
+ ASN.1 notation. The ASN.1 notation is documented in the standard
+ definition X.680, which is the primary text. It can also be
+ helpful, but not necessary, to read the standard definitions
+ X.681, X.682, X.683, X.690, and X.691.</p>
+ <p>A good book explaining those reference texts is
+ Dubuisson: ASN.1 - Communication Between Heterogeneous Systems,
+ is free to download at
+ <url href="http://www.oss.com/asn1/dubuisson.html">http://www.oss.com/asn1/dubuisson.html</url>.</p>
+ </section>
+
+</chapter>
+