簡介：
原文：
https://www.itu.int/dms_pub/itu-t/oth/0B/04/T0B040000492C01PDFC.pdf
ASN.1是一種能夠以獨立於語言、平台和編碼的形式，對計算機間交流的信息內容 進行定義的符號，並將這一定義稱為“用於通信的抽象語法”。 如將它與“有效語法”的ABNF或“有效文件”的XSD概念進行比較，后一種概念 完全側重於數據的有效編碼，不關心任何可能附加給這類編碼的意義，即沒有任何 必要的語義聯系。
ASN.1定義可方便地映射至C、C++、C#或Java數據結構等格式，用於應用編碼， 並通過以XML或TLV（類型-長度-價值）或極緊密排列的編碼格式提供表示形式編 解碼的存儲庫而得到支持。 ASN.1廣泛用於需要有效（低帶寬、低交易成本）計算機通信的行業部門以及需要 高速信息編解碼的部門（例如，生物計量信息和電話交換的傳送）。
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}) } |
應用方式：
http://harmony.apache.org/subcomponents/classlibrary/asn1_framework.html#Overview
