1、BRITISH STANDARD BS ISO 11788-1:1997 Electronic data interchange between information systems in agriculture Agricultural data element dictionary Part 1: General description ICS 35.240.60; 65.020.99BSISO11788-1:1997 This British Standard, having been prepared under the direction of the Engineering Se
2、ctor Board, was published under the authorityof the Standards Board and comes into effect on 15 December 1997 BSI 04-1999 ISBN 0 580 29031 X National foreword This British Standard reproduces verbatim ISO11788-1:1997 and implements it as the UK national standard. The UK participation in its preparat
3、ion was entrusted to Technical Committee AGE/31, Agricultural electronic equipment, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interes
4、ts informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referre
5、d to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a con
6、tract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, pages ii to
7、 iv, pages 1 to 8, an inside back cover andabackcover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSISO11788-1:1997 BS
8、I 04-1999 i Contents Page National foreword Inside front cover Foreword iii Text of ISO11788-1 1ii blankBSISO11788-1:1997 ii BSI 04-1999 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Normative reference 1 3 Definitions 1 4 Abbreviations 2 5 Requirements 2 5.1 General 2 5.2 Procedures and lev
9、els of standardization 2 5.3 Description of ADED 3 5.3.1 Reading ADED 3 5.3.2 Main ADED characteristics 3 5.3.3 Data elements 3 5.3.4 Entity 3 Annex A (normative) Header data 5 Annex B (informative) Controlling agencies of national data dictionaries 8 Annex C (informative) Bibliography Inside back c
10、over Descriptors: Agriculture, agricultural equipment, computer applications, computer assisted management, information interchange, data processing, data transfer, data exchange, data elements, dictionaries, description.BSISO11788-1:1997 BSI 04-1999 iii Foreword ISO (the International Organization
11、for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has t
12、he right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft I
13、nternational Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO11788 was prepared by Technical Committee ISO/TC23, Trac
14、tors and machinery for agriculture and forestry, Subcommittee SC19, Agricultural electronics. ISO11788 consists of the following parts, under the general title Electronic data interchange between information systems in agriculture Agricultural data element dictionary: Part 1: General description; Pa
15、rt 2: Dairy farming; Part 3: Pig farming; Part 4: Poultry farming; Part 5: Non-animal stationary application. Annex A forms an integral part of this part of ISO11788. Annex B and Annex C are for information only.iv blankBSISO11788-1:1997 BSI 04-1999 1 Introduction Standalone computers on the farm re
16、quire that data must be manually entered and collected from the different computers. This is a laborious task which becomes superfluous when the computers are interconnected and able to communicate with each other automatically to share and exchange information. Information exchange means data trans
17、port between the management computer on one side and each process computer on the other side. An agricultural data element dictionary (ADED) consists of data elements that may be used in the agricultural sector to exchange data electronically. ADED is closely linked to agricultural data interchange
18、syntax (ADIS), which is a syntax used in the agricultural sector to exchange data electronically. ADED in combination with ADIS makes electronic data interchange possible. In a data element dictionary all data elements are described in a unique way. Each element is uniquely identified by a data dict
19、ionary number (DD number). Data dictionaries for data exchange between management computers and process computers may be subsets of larger data dictionaries. The standardization of on-farm data interchange between management computer and stationary process computers consists of an ADIS and an ADED.
20、ADIS is described in ISO11787. A general description of ADED is given in this part of ISO11788, the other part of ISO11788 describe data dictionaries for different fields of application. This part of ISO11788 describes the general structure of an agricultural data element dictionary; lists the attri
21、butes of data elements and entities; gives the header structure (an entity that is used in all data interchanges, independent of the field of application). NOTEThe term “process computer” can also be read as “datalogger”. 1 Scope The data elements described in ISO11788 are intended for communication
22、 between on-farm process computers and management computers. This part of ISO11788 specifies how an agricultural data element dictionary (ADED) may be used for on-farm data exchange. The data elements concerning mobile equipment are not dealt with in this part of ISO11788. ADED data elements may be
23、used for: direct data exchange between process computer and management program; data exchange between process computer and interface software of the process computer on the management computer (PC) (alternatively, manufacturer-specific methods may be used for this exchange); data exchange between th
24、e interface software for the process computer on the PC and the management program. NOTEThis does not mean that agricultural data elements cannot be used for other data interchange. Many farmers use a method similar to ADIS to exchange data between management computers and external computers. ADED m
25、ay be used for data interchange to external computers or to exchange data between independent software applications used on a management computer. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO11788. A
26、t the time of publication, the edition indicated was valid. All standards are subjected to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS
27、O maintain registers of currently valid International Standards. ISO 11787:1995, Machinery for agriculture and forestry Data interchange between management computer and process computers Data interchange syntax. 3 Definitions For the purposes of this part of ISO11788, the following definitions apply
28、. 3.1 agricultural data element dictionary (ADED) description of standardized data elements used for agricultural purposes 3.2 agricultural data interchange syntax (ADIS) syntax for data exchange between management computer and process computer on a farm 3.3 attribute characteristic of an object or
29、entity 3.4 data dictionary database or list in which all data elements are described in a unique wayBSISO11788-1:1997 2 BSI 04-1999 3.5 data element unit of data for which the definition, identification, representation and permissible values are specified by means of a set of attributes 3.6 DD numbe
30、r number that is used to identify a data element in a data dictionary with a 6-digit decimal code 3.7 electronic data interchange (EDI) electronic transfer from computer to computer of commercial or administrative transactions using an agreed standard to structure the transaction or message data 3.8
31、 entity defined set of data elements 3.9 entity number number used to identify an entity in an ADIS line (6-digit decimal code) 3.10 event same meaning as the term entity NOTEIn the description of ADIS syntax (ISO11787) the term event is used. This standard uses the term entity. 3.11 index tree set
32、of all key data elements of an entity which defines the context of a particular data element in the ADIS data record by indicating which other data elements must be combined with it 4 Abbreviations 5 Requirements 5.1 General The data to be exchanged between management computers and process computers
33、 shall be presented in standard files for data exchange on the management computer. For data exchange it is necessary that the data are known to both parties. The management system and the process computer system shall each provide the programs for conversion of its data to or from the standard file
34、s for data exchange. ADIS is needed to enter the data into the standard exchange file. In order to handle information by computer, it is necessary that the sending and receiving computers use the same terminology. This terminology is the data element dictionary. Data elements shall be available for
35、all branches of agriculture on an international level. 5.2 Procedures and levels of standardization Several data dictionaries may be used for data exchange using ADIS (international ADED, national ADED, application specific data dictionary, manufacturer specific data dictionary, etc.). An internatio
36、nally standardized ADED is needed to make exchange possible between systems of different manufacturers of different countries. There are different standardization levels for data elements: AN: Alphanumeric C: Conditional DD: Data Dictionary K: Key data element M: Mandatory N: Numeric O: Optional Obl
37、: Obligation Level 1: Data elements are centrally registered on an international basis (ISO). The first digit of the DD number for ISO-standardized data elements is 9. Level 2: Data elements are centrally registered on a national basis. The first digit of the DD number for national data elements is
38、a number from1 to 8. Level 3: Data elements are manufacturer specific. The first digit of the DD number for manufacturer-specific data elements is 0. This range of “free numbers” may be used for manufacturer-specific experimenting. Manufacturers are advised to request a registered number to replace
39、the manufacturer-specific number as soon as the element is implemented in an official release of their software.BSISO11788-1:1997 BSI 04-1999 3 A national agreement shall be reached for each new data element before it is brought to international attention. Reaching a national agreement is a matter w
40、hich each country has to organize by itself through the national working groups for each subject area. When a new ADED element is proposed, it shall be agreed upon by all parties concerned. Once it has been agreed upon within the ISO structure, it achieves the status of an international ADED element
41、, standardized by ISO. 5.3 Description of ADED 5.3.1 Reading ADED The following decisions have been made concerning the international ADED: the identifier of a DD element shall be the 6-digit DD number, also called the ADED number; 65 positions are available for the name of the DD element; the data
42、type of an element may be “alphanumeric” or “numeric”. The data type “signed” is not used. Instead of “signed”, “numeric” is used. This means that one of the available positions of the format length of the attribute is used for the minus sign; ISO units shall be used in the DD. 5.3.2 Main ADED chara
43、cteristics Both the sending and receiving party need to have a data dictionary, or a subset of it, which holds the characteristics of each data dictionary element. The main characteristics of ADED are: data elements use extended ASCII characters (ISO 8-bit code); data elements are part of at least o
44、ne entity (see5.3.4). 5.3.3 Data elements The following attributes are described for each data element. 5.3.4 Entity Within the communication field, a set of data elements that form a logical group is defined as an entity type for EDI. It consists of mandatory key data elements and other optional da
45、ta elements. There are different levels of standardization of entities (comparable to the standardization of data elements): The first two digits of centrally registered entities on an international level are99. These are defined in advance and already known to all members of the communication group
46、 before receiving. NOTEEntity numbers start with 99 to avoid confusion with data element numbers. The first digit of centrally registered entities on a national level is a number from 1 to 8. These numbers are predefined and already known to all members of the communication group before receiving. T
47、he entity numbers are created by the system when writing an ADIS file. The entity number does not have a specified meaning. It may be used to identify different data blocks. In this case, the entity number starts with0. Therefore entity numbers starting with a zero are free to be used by manufacture
48、rs. The entity number does not have any meaning:its value is“000000”. Each registered entity is described as a possible group of DD-numbers. The entity must start with the key data elements. The other elements are optional and have no specified order. National or manufacturer-specific data elements
49、may be added to a registered entity. When transferring a data element it is necessary to transfer the key data elements of the logical group (entity) to which it belongs. The set of key data elements (index tree) is not in the description of the data element but can be found in the entity description. k ADED-number: the numbering of data elements of ADED starts with 900001, except for the data element “data dictionary type” which has the ADED-number000000. The numbering continues as running number without any other logical
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