简介：
原文：
https://www.itu.int/dms_pub/itu-t/oth/0B/04/T0B040000492C01PDFC.pdf
ASN.1是一种能够以独立于语言、平台和编码的形式，对计算机间交流的信息内容 进行定义的符号，并将这一定义称为“用于通信的抽象语法”。 如将它与“有效语法”的ABNF或“有效文件”的XSD概念进行比较，后一种概念 完全侧重于数据的有效编码，不关心任何可能附加给这类编码的意义，即没有任何 必要的语义联系。
ASN.1定义可方便地映射至C、C++、C#或Java数据结构等格式，用于应用编码， 并通过以XML或TLV（类型-长度-价值）或极紧密排列的编码格式提供表示形式编 解码的存储库而得到支持。 ASN.1广泛用于需要有效（低带宽、低交易成本）计算机通信的行业部门以及需要 高速信息编解码的部门（例如，生物计量信息和电话交换的传送）。
例子：
3GPP RANAP V6.2.0.asn
|
-- FILE: @(#)RANAP-PDU-Descriptions.asn13.2 04/09/14
-- 3GPP TS 25.413 V6.2.0 (2004-06) -- 9.3.2Elementary Procedure Definitions -- ************************************************************** -- -- Elementary Procedure definitions -- -- **************************************************************
RANAP-PDU-Descriptions { itu-t (0) identified-organization (4) etsi (0) mobileDomain (0) umts-Access (20) modules (3) ranap (0) version1 (1) ranap-PDU-Descriptions (0)}
DEFINITIONS AUTOMATIC TAGS ::=
BEGIN
-- ************************************************************** -- -- IE parameter types from other modules. -- -- **************************************************************
IMPORTS Criticality, ProcedureCode FROM RANAP-CommonDataTypes
Iu-ReleaseCommand, Iu-ReleaseComplete, RelocationCommand, RelocationPreparationFailure, RelocationRequired, RelocationRequest, RelocationRequestAcknowledge, RelocationFailure, RelocationCancel, RelocationCancelAcknowledge, SRNS-ContextRequest, SRNS-ContextResponse, SecurityModeCommand, SecurityModeComplete, SecurityModeReject, DataVolumeReportRequest, DataVolumeReport, Reset, ResetAcknowledge, RAB-ReleaseRequest, Iu-ReleaseRequest, RelocationDetect, RelocationComplete, Paging, CommonID, CN-InvokeTrace, CN-DeactivateTrace, LocationReportingControl, LocationReport, InitialUE-Message, DirectTransfer, Overload, ErrorIndication, SRNS-DataForwardCommand, ForwardSRNS-Context, RAB-AssignmentRequest, RAB-AssignmentResponse, RAB-ModifyRequest, PrivateMessage, ResetResource, ResetResourceAcknowledge, RANAP-RelocationInformation, LocationRelatedDataRequest, LocationRelatedDataResponse, LocationRelatedDataFailure, InformationTransferIndication, InformationTransferConfirmation, InformationTransferFailure, UESpecificInformationIndication, DirectInformationTransfer, UplinkInformationTransferIndication, UplinkInformationTransferConfirmation, UplinkInformationTransferFailure FROM RANAP-PDU-Contents
id-LocationRelatedData, id-CN-DeactivateTrace, id-CN-InvokeTrace, id-CommonID, id-DataVolumeReport, id-DirectTransfer, id-ErrorIndication, id-ForwardSRNS-Context, id-InformationTransfer, id-InitialUE-Message, id-Iu-Release, id-Iu-ReleaseRequest, id-LocationReport, id-LocationReportingControl, id-OverloadControl, id-Paging, id-privateMessage, id-RAB-Assignment, id-RAB-ReleaseRequest, id-RAB-ModifyRequest, id-RANAP-Relocation, id-RelocationCancel, id-RelocationComplete, id-RelocationDetect, id-RelocationPreparation, id-RelocationResourceAllocation, id-Reset, id-SRNS-ContextTransfer, id-SRNS-DataForward, id-SecurityModeControl, id-ResetResource, id-UESpecificInformation, id-DirectInformationTransfer, id-UplinkInformationTransfer FROM RANAP-Constants;
-- ************************************************************** -- -- Interface Elementary Procedure Class -- -- **************************************************************
RANAP-ELEMENTARY-PROCEDURE ::= CLASS { &InitiatingMessage, &SuccessfulOutcomeOPTIONAL, &UnsuccessfulOutcomeOPTIONAL, &OutcomeOPTIONAL, &procedureCodeProcedureCode UNIQUE, &criticalityCriticality DEFAULT ignore } WITH SYNTAX { INITIATING MESSAGE&InitiatingMessage [SUCCESSFUL OUTCOME&SuccessfulOutcome] [UNSUCCESSFUL OUTCOME&UnsuccessfulOutcome] [OUTCOME&Outcome] PROCEDURE CODE&procedureCode [CRITICALITY&criticality] }
-- ************************************************************** -- -- Interface PDU Definition -- -- **************************************************************
RANAP-PDU ::= CHOICE { initiatingMessageInitiatingMessage, successfulOutcomeSuccessfulOutcome, unsuccessfulOutcomeUnsuccessfulOutcome, outcomeOutcome, ... }
InitiatingMessage ::= SEQUENCE { procedureCodeRANAP-ELEMENTARY-PROCEDURE.&procedureCode({RANAP-ELEMENTARY-PROCEDURES}), criticalityRANAP-ELEMENTARY-PROCEDURE.&criticality({RANAP-ELEMENTARY-PROCEDURES}{@procedureCode}), valueRANAP-ELEMENTARY-PROCEDURE.&InitiatingMessage({RANAP-ELEMENTARY-PROCEDURES}{@procedureCode}) }
SuccessfulOutcome ::= SEQUENCE { procedureCodeRANAP-ELEMENTARY-PROCEDURE.&procedureCode({RANAP-ELEMENTARY-PROCEDURES}), criticalityRANAP-ELEMENTARY-PROCEDURE.&criticality({RANAP-ELEMENTARY-PROCEDURES}{@procedureCode}), valueRANAP-ELEMENTARY-PROCEDURE.&SuccessfulOutcome({RANAP-ELEMENTARY-PROCEDURES}{@procedureCode}) }
UnsuccessfulOutcome ::= SEQUENCE { procedureCodeRANAP-ELEMENTARY-PROCEDURE.&procedureCode({RANAP-ELEMENTARY-PROCEDURES}), criticalityRANAP-ELEMENTARY-PROCEDURE.&criticality({RANAP-ELEMENTARY-PROCEDURES}{@procedureCode}), valueRANAP-ELEMENTARY-PROCEDURE.&UnsuccessfulOutcome({RANAP-ELEMENTARY-PROCEDURES}{@procedureCode}) }
Outcome ::= SEQUENCE { procedureCodeRANAP-ELEMENTARY-PROCEDURE.&procedureCode({RANAP-ELEMENTARY-PROCEDURES}), criticalityRANAP-ELEMENTARY-PROCEDURE.&criticality({RANAP-ELEMENTARY-PROCEDURES}{@procedureCode}), valueRANAP-ELEMENTARY-PROCEDURE.&Outcome({RANAP-ELEMENTARY-PROCEDURES}{@procedureCode}) } |
应用方式：
http://harmony.apache.org/subcomponents/classlibrary/asn1_framework.html#Overview
