Specification for classification of standard literature

time: 2023-06-10 20:19:27
  • GB/T 39910-2021
  • in force

Basic Information

  • Standard:

    GB/T 39910-2021

  • standard name:

    Specification for classification of standard literature

  • Standard category:

    National Standard (GB)

  • release date:

    2021-03-09
  • Implementation date:

    2021-10-01

standard classification number

  • Standard ICS number:

    General, Terminology, Standardization, Documentation>>Informatics, Publishing>>01.140.20Informatics
  • China Standard Classification Number:

    General>>Economy, Culture>>A14 Library, Archives, Documentation and Information Work

associated standards

Publication information

  • publishing house:

    China Standard Press
  • Publication date:

    2021-03-01

other information

  • drafter:

    Zhou Jie, Li Aixian, Wang Bin, Cheng Nufan, Wang Jiazhen, Li Jing, Xiao Yongshu, Huang Hai, Lü Yong, Zhou Qiongqiong, Li Jing, Xu Donghui
  • Drafting unit:

    China National Institute of Standardization, National Science and Technology Infrastructure Platform Center, Guangzhou Institute of Standardization, Shenzhen Institute of Standards and Technology, Shanghai Institute of Quality and Standardization
  • Focal point unit:

    National Science and Technology Platform Standardization Technical Committee (SAC/TC 486)
  • Proposing unit:

    Ministry of Science and Technology of the People's Republic of China
  • Publishing department:

    State Administration for Market Regulation National Standardization Administration
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GB/T 39910-2021.Specification for classification of standard literature.
Scope
GB/T 39910 specifies the basis, steps and rules for the classification of standard literature.
GB/T 39910 applies to the classification of standard literature.
2 Normative references
The following documents are indispensable for the application of this document. For any dated reference, only the dated version applies to this document. For any undated reference, the latest version (including all amendments) applies to this document.
Chinese Standard Literature Classification
International Standard Classification
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
General standards
Basic standards applicable to different professional categories or different categories in the same profession. Method standards, environmental protection, safety and health standards, and standards for general parts, general equipment, general machinery, etc.
3.2
Specialized standards
Standards with special uses for a certain profession and specified in the classification method as special categories or within the scope of a certain category.
3.3
Theme object
The object involved and regulated by the subject content of the standard document, generally the standardization object.
3.4
?? Core subject
The core concept that most essentially reflects the subject content of the standard document among the concepts that constitute the subject of the standard document.
3.5
Theme facet
The characteristic aspect that reflects a certain aspect of the concept or attribute of the standardization object in a standard document with complex themes. .
3.6
Standards type standards type
Classification of standards formed by standardizing a certain aspect of the standardization object.
Note: Such as terminology standards, product standards, inspection standards, etc.
3.7
Faceted class
In the standard classification method, the quasi-superior class is set up to logically divide the subordinate classification. The faceted class is only used to limit the scope and is not used as a classification category.
This standard specifies the basis, classification steps and classification rules for the classification of standard documents. This standard applies to the classification of standard documents.


Standard contentStandard content

Some standard content:

ICIS01.140.20
National Standard of the People's Republic of China
GB/T39910—2021
Classification rules for standard literature
Specification for classification of standard literature2021-03-09Issued
State Administration for Market Regulation
National Administration of Standardization
Issued
2021-10-01Implementation
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Foreword
Scope
Normative references
Terms and definitions
Classification basis
Classification steps
Classification rules
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GB/T 39910—2021
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This standard was drafted in accordance with the rules given in GB/T1.12009. This standard was proposed by the Ministry of Science and Technology of the People's Republic of China. This standard is under the jurisdiction of the Shantou Science and Technology Platform Standardization Technical Committee (SACTC486). GB/T 39910—2021
Drafting units of this standard: China National Institute of Standardization, National Science and Technology Infrastructure Center, Guangzhou Standardization Research Institute, Shenzhen Standard Technology Research Institute, Shanghai Quality and Standardization Research Institute Drafters of this standard: Zhou Jie, Li Aixian, Zhi Bin, Cheng Nufan, Tu Jiazhen, Li Jing, Xiao Yongshu, Huang Hai, Lv Yong, Zhou Qiong, Li Jing, Xu Donghui.
-rrKaeerkAca-
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1 Scope
Classification rules for standard documents
This standard specifies the basis, steps and rules for the classification of standard documents. This standard applies to the classification of standard documents: 2 Normative references
GB/T39910—2021
The following documents are indispensable for the application of this document. For any dated referenced document, only the dated version applies to this document. For any undated referenced document, its latest version (including all amendments) applies to this document, China Standard Document Classification
International Standard Classification
3 Terms and definitions
The following terms and definitions apply to this document. 3.1
General standards
Basic standards, method standards, environmental protection, safety and health standards, and common parts, equipment, machinery, etc. applicable to different professional categories or different categories in the same profession. 3.2
Specialized standards
Specialized standards
Standards that have special uses for a certain profession and are specified in the regulations as special categories or within a certain category: 3.3
themeobject
The object involved and regulated by the subject content of the standard is generally the standardization object of the standard. 3.4
Core subject
The most essential of the concepts constituting the subject of a standard document. The core concept of the subject of a standard document. 3.5
Themefacet
The characteristic aspect of a certain aspect of the concept or attribute of the standardization object in a standard document with a complex subject. 3.6
Standard type
Standards typo
The category of standards formed by standardizing a certain aspect of the standardization object. Note: Such as terminology standards, product standards, inspection standards, etc. 3.7
Faceted class
Faceted class
The quasi-superior class set up in the standard classification method for logical division of subordinate classifications. The faceted class is only used as a category limiter and is not used as a sub-class.
4 Classification basis
4.1 Based on the structure and classification principles of the standard classification system, the classification of standard documents should be based on the subject content of the document or the professional category of the standard object. The form, genre, region, country, year, etc. of the document are not used as the basis for classification. 4.2 The classification of standard documents should also be based on the applicable scope of the document. According to the classification principles stipulated in the classification system, the document should be classified into the appropriate category.
5 Classification steps
5.1 Document subject analysis
5.1.1 Determine the subject object
Analyze the subject content, professional scope, standard use, and standard type of the standard document through the title, scope, preface, introduction, revision information, consistency information, date, and text of the standard document, and determine the standardization object regulated by the standard document. 5.1.2 Determine the core of the subject
Through the analysis of the main components of the subject content of the standard document, screen the core subject content regulated by the standard. 5.1.3 Determine the subject aspect
Through the analysis of the subject object, subject core, standard type and various elements forming the subject of the standard document, extract the various aspects that constitute the subject content and determine the subject core and its relationship with various elements and the importance of each aspect. Typical subject aspects include: object-process-result-attribute method/tool
The analysis of the subject should mainly consider: object (or product) with specific purpose or attribute/(process) process of object (or product)/detection (inspection) method of object (or product)/(processing) equipment of object (or product) (processing) result/contamination result/hazard determination, protection and control, etc.
5.2 Search in classification table
After the subject object, subject core, subject and standard type of the document are determined through the analysis of the document, search for suitable, specific or close professional categories in the classification table according to the structure and classification principles of the classification method, as well as the classification table and classification notes. 5.3 Determination of classification
According to the classification principles proposed in the current classification rules, select the most appropriate professional award items for classification. 6 Classification rules
6.1 General principles of classification
6.1.1 Scientific nature of classification
Before classification, the system structure and classification rules of the classification method should be carefully studied. Classification should be carried out according to the standard theme and the discipline to which the standard document belongs.
6.1.2 Systematic nature of classification
GB/T39910—2021
The classification of standard documents should reflect the logic and systematic nature of the classification. The identification of the profession to which the standard belongs should take into account the logic and systematicness of the overall classification and the relationship between disciplines and professions in the classification, so as to effectively distinguish similar categories, distinguish related disciplines and industries, distinguish the differences in technology, objects and processes, equipment, materials, engineering, environment, safety and other standards, and classify them in combination with the compilation principles of the classification method and the setting of the classification method. 6.1.3 Systematicity of classification
Pay attention to the systematicity of the classification table. Master the relationship between the comprehensive category and the general category, the application standard and the special standard in the classification category, and make accurate distinctions according to the content and purpose of the document. 6.1.4 Consistency of classification
For the same standard or standards of the same nature, attention should be paid to the consistency of classification. Check and verify according to the classification work procedures and use the monthly record.
6.1.5 Determination of the subject of the document
Be familiar with the standardization object described in the document and master the purpose of standard formulation and revision. If the application scope of the standard cannot be determined, the relevant technical committees, sub-technical committees and the standards-making working group can be considered. The standard title can generally express the subject content of the standard, but the standard generally does not specify the exact purpose of the standard in the title. It is difficult to correctly judge the purpose and professional classification of the standard only by the professional name, product name and common name of the standard object. Therefore, the ultimate basis for document classification should be the nature of the document content, not just the standard title. 6.2 Classification rules of China Standard Document Classification Note: The sub-numbers cited in the East Section are the sub-numbers of China Standard Document Classification. 6.2.1 Classification of general standards
6.2.1.1 Standards with broad guiding significance to the public, such as comprehensive basic standards, economic culture, basic disciplines.Comprehensive general technical standards are concentrated in the "comprehensive" category. Example 1: "Standard billion benefit evaluation Part 1: General principles for economic benefit evaluation", "A comprehensive category, internal \ A00 standardization, quality management" category, Example 2: Ergonomics public places and work areas of danger signals, ergonomics auditory signals", "A comprehensive" category, classified in the "A2 ergonomics" category. Example 3: "Silver card magnetic stripe information format and usage specifications. "A Yuanhe" award, in the "A11 finance, insurance" category. Example 4: "Qualification Assessment Rules for Nondestructive Testing Personnel in the Electric Power Industry", Human\A Comprehensive\Humanity in\A18 Education, Degree, Academic Qualification\Category: Example 5: "Seismic Observation Methods Electromagnetic Disturbance Observation 3, Human\A Comprehensive\Major Category, Classified in\A-4 Earth Science\Category Example 6: "Marking Methods for Various Parts during Packaging, Transport Package Testing" Human "A Comprehensive" Major Category·Classified in "A80 Marking, Packaging, Transport, Storage and Training" Category:
6.2.1.2 For standards that are common between two or more major professional categories, the specific classification rules shall be handled in accordance with the classification principles of standards involving several subject contents, and the requirements given in Section 2.3 shall apply. 6.2.1.3 Same: Standards that are common between two or more facet identifications within the human category shall be classified into the major comprehensive category under the human category. Example 1: Color determination method of liquid chemical products (He2Cn unit - platinum - diamond color number), general standard of human "G chemical" category, classified in human comprehensive "G00/0% chemical comprehensive\ten\GO1 chemical basic standards and general methods\category. Example 2: Comprehensive design guide for gas equipment, included in the "K medium T\ category of standing standards, listened to the comprehensive category "K30/09 medium T comprehensive "K09 health, safety, labor protection" categorybzxZ.net
Example 3: "Overhead communication line iron fork beam", included in the "M road signal, take" general standard, classified in the grand prize comprehensive "M0/road signal,! "M05 General parts and circuit equipment\Class 6.2.1.4 The standards common to two or more first-level categories within the same facet identification are included in the comprehensive category within the scope of the facet identification. At this time, please pay attention to the difference between the standards involving the two topics. Example 1: Ratings and performance of rotating motors", the general standards in the "K23/29 rotating motors" facet marking are classified in the "K20 rotating motors comprehensive" category. Example 2: Textile knitted fabric structure representation method 3, the general standards in the "W60/64 knitting" facet marking are classified in the "W6C knitting combined" category. Example 3: Classification of multiple canned foods", the general standards in the "X70/79 canned" facet marking are classified in the "X70 canned" comprehensive category. 6.2.2 Classification of special standards
6.2.2.1 Special standards should be classified into corresponding categories according to their professional affiliation and the concept of the classification table class name. Example: "Principles for the preparation of instructions for use of musical instrument products", "Y light industry, cultural and daily necessities" human beings,! [In the "Y58 musical instruments\ category. 6.2.2.2 Special standards should be classified according to common professions and the concepts in the scope notes of the classification table categories should be divided into corresponding categories. Example 1: Aerospace Equivalent Terms List Part 2: Aerospace Rivets, the "V20 Fasteners" category is specified in the "V58 Musical Instruments\ category, and its specification note is "screws, nuts, bolts, rivets, etc. for aviation and spacecraft", so it is classified in the "V2C Fasteners" category, not the "113 Fasteners" category of the "Machinery" category.
Example 2: Marine crane slewing bearing", in the "1.24 Marine Devices" category of the I category, its specification note is "Lifting, towing and operating devices, etc." For this bamboo, in the "124 Marine Devices" category, it is not the "S0 Lifting Machinery" category of the "Machinery" category. 6.2.2.3 Special standards should be classified into corresponding categories according to their professional affiliation and the guidance of the classification table. Example: "Railway freight copper trays, in the specification annotation of "S93 Freight" in "S Railway", there is a guidance annotation of "case packaging, container bags, pallets and child maintenance A8." Therefore, it is not included in the "S93 Freight" category, but in the "A8 container pallet rack" category. 6.2.2.4 Special standards should be classified into corresponding categories according to their professional affiliation and the scope and connotation contained in the category name concept or the scope annotation concept contained in the classification table. Example 1: General specification of direct-acting medium-speed electric hoists, according to the category name concept, it is included in the "1.31 acoustic components" category of "1.31 acoustic components" category:
Example 2: "Ultraviolet lamps, according to the category of "K electrician" in the \K71 electric light source products" category specification with the annotation "white lamps, high and low mercury lamps, steel lamps, xenon lamps, Qul lamps, Yu Yu halide lamps, etc. \ are classified into the "K71 electric light source products" category. 6.2.3 Classification of standards involving several subject contents 6.2.3.1 Standards involving multiple parallel subjects should be divided into multiple categories according to the classification method. Example 1: Test of the bonding strength between each layer of rubber and plastic hoses. First, it is classified as "rubber hoses" and classified into the "G12 hoses, tapes, adhesive tapes, and rubber sheets" category. Secondly, it is supplemented by "plastic hoses" and classified into the "GS3 single material profiles" category. Example 2: Environmental awareness design evaluation guidelines for electrical and electronic products are divided into "K4 resistance standards and methods" and "I. Electronic components" of the "K electric T" category. "104 Basic Standards and Near-term Methods" of the "Device and Information Technology" 6.2.3.2 Standards for topics involving two subordinate relationships or primary and secondary relationships or the relationship between basic industries and extended industries should be classified according to the major concepts, major concepts and topics of basic industries. For the purpose of retrieval, the subordinate concepts, minor concepts or extended industry concepts can also be supplemented with classification.
Example 1: Determination of family, hydrogen and nitrogen in petroleum products and lubricants by element analyzer method ". People\E Shishan" category, classified into "standard\E30 right note product comprehensive" category, or it can be classified into "F petroleum" category according to the needs of retrieval application, and classified into "lubricating oil" category Ⅱ Example 2: Automobile, Kuto car instrument model analysis method, people "T car transfer\ major category, classified into \T33 automotive instruments and measuring equipment\ category. It can also be classified into "T Vehicles" category 6. Classified in the "185 Electronic and electrical equipment" (motorcycle) category, Example 3: ≤Simple test method for the amount of organic magnetism and amino acid ester pesticide (enzyme inhibition method) 3 "B Agriculture, Forestry" category, classified in \B3 Fruit and vegetable seeds and "Products" category, can be classified into \X Food\ category according to the search application needs, classified in \X26 Vegetable processing and products\ category, 6.2.4 Standard classification of categories with special guidance notes should be classified according to the method specified in the guidance notes
Example 1: "Fuse fuse piece", in the "H62 Heavy metals and their alloys" category notes, it is specified that "electrical fuse", and this standard is classified in -riKaeerkAca-
in \H62 Heavy metals and their alloys", not in "K.4 Electrical T alloy parts\ category. GB/T 39910—2021
Example 2: "Guidelines for the design and operation of low-oil ignition systems for coke furnaces in thermal power plants" 3. In the annotation of the "T37 spark plugs" category, it is specified that "high-energy igniters are included", so this standard does not include the "T37 spark plugs" category in the "T37 spark plugs" category, nor the "I98 boilers and their auxiliary equipment" category. Example 3: Enameled winding wire insulation varnish Part 1: General requirements 3, in the annotation of the "GJ coating" category, it is specified that "insulating varnish is K15", and in the annotation of the "KI3 electrical insulating materials and their products" category, it is specified that it includes "electrical insulating varnish", so it is classified in the "15 electrical insulating materials and their products" category 6.2.5 Classification of basic industry and comprehensive technical standards Standards for infrastructure, environmental protection, metal and non-metal materials, etc. should be classified into the corresponding categories of basic industry and comprehensive technology categories. Example 1: "Test procedures for high-voltage direct current transmission project system, "Health Engineering Construction" \P62 Transmission and transformation engineering\Class II. Example 2: Emission limits and measurement methods for exhaust pollutants from heavy-duty vehicles and automobiles (China Phase I, Stage II)”, “Z64 Mobile pollution source emission improvement standards” in the “Environmental Protection” category. Example 3: “Reinforced concrete steel bar”, “H1 steel and special-shaped steel” in the “H metallurgy” category. Example 4: Structural steel for ships and marine engineering, although there is no special steel for ships, it is not specified in the “U ship” category that the steel for ships is classified into the “H/Steel” category, so it is concentrated in the “H metallurgy” category and classified in the “H/Steel plate” category. Example 5: Impregnated graphite electrodes, “Q51 graphite materials” in the “Q building materials” category. Example 6: Film cores for Chinese film and magnetic film rolls, “81 photosensitive materials” in the “chemical” category. ". Example 7: The national food safety standard for food contact materials and products generally requires safety requirements for food production, storage and transportation equipment. We do not classify them into "X90 Food Processing Machinery Comprehensive". Instead, we classify them into the "G Chemical Industry" category, and ask in "G43 Rubber Seals" and "G32 Synthetic Tires, Plastics" categories: 6.2.6 Classification of cross-industry product standards
If two industrial categories involve a type of product at the same time, when the product involved in the standardization object is the product of the first industry or the initial processing of the product, the standard is classified into the first industrial category; when the product involved in the standardization object is further processed or deeply processed in the second industry, the standard is classified into the first industrial category. Example 1: Tobacco products, when the standardization object is tobacco planting technology and products, or tobacco harvesting and initial processing The origin of flue-cured tobacco, such as the flue-cured tobacco curing technology, is classified into the "B35 tobacco, beverage crops and products" of the agricultural category. And its deep-processed products, such as tobacco, tobacco, etc. For example, Part 4 of cigarettes: Sensory technical requirements, is classified into "87 tobacco products".
Example 2: rails, fishplates, etc., such as fishplate type and size for every 50 kg of steel, the "1152 titanium road steel" of the human industry, and the special-shaped rails, welded long rails, special-shaped fishplates, etc. for turnouts, engraved track basins and fishplates, copper rails, Part 3: Special-shaped rails, are classified into the "S11 line components" of the railway category. Example 3: rice, wheat, corn, etc., such as wheat for raw materials, "B agriculture, hosiery industry" is classified into the "B22 grain structures and products", and grain processing and products, etc., northern wheat Standard sample of powder processing accuracy, standard powder, divided into "X food" human \X11 grain processing and products\ category · "National Food Safety Standard Pastry, and packaging main specification. Divided into "X food\ category\X28 baked products\ category. 6.2.7 Classification of product parts, processes, tooling and test methods and equipment standards 6.2.7.1 When there are special categories for processes, tooling, tests, parts, equipment, etc. for specific products in the "China Standard Document Classification Method", the corresponding standards should be divided into special categories. Example 1: Destructive test of metal material welds Cold crack test of weldments Arc welding method Part 1: General principles, divided into \|Machinery" category, classified in "133 Welding and cutting\ category and arc welding equipment Part 3: Arc starting and arc equipment". Example 2: "Ordinary abrasive corundum", classified as "I machine tool", classified as "J41 abrasives and grinding tools". And "Precision inspection of centerless external mesh grinder", classified as "J machine tool", classified as "J55 grinder tool". Example 3: Multi-die movable guide steel plate mold frame, part 1: rear guide column mold frame", classified as "machine tool", classified as "1-16 mold tool". And "Technical conditions for closed cold extrusion presses" is classified as "machine tool", classified as "J62 forging machinery". Example 4: "Determination of volume convexity of open and closed cells of rigid foam plastics", classified as "G chemical industry", classified as "G31 synthetic wood clothing, basic plastic standards and general methods". And the rigid polyurethane foam plastics used in refrigerators and iceboxes are classified into the "Chemical" category and belong to the "32 Synthetic resins and plastics" category. Example 5: "Automobiles and anti-vehicle plate (frame) and its position registration", classified into the "T Automobile" category, and classified into the "T28 Front sheet metal parts of vehicles" category. And the strength requirements and test methods for automobile seats, seat fixing devices and headrests are classified into the "Industrial Automobile" category and classified into the "T26 Body driving rate) and accessories" category. Example 6: "Natural Gas Sampling Rules" are classified into the "E Petroleum" category and belong to the "F21 Natural Gas" category. "Test Method for Free Water in Liquefied Petroleum Gas" is classified into the "E Petroleum" category and belongs to the "E Refining" category. Gas" category. The floating level gauge used to measure the liquid level in the refrigerated light hydrocarbon fluid storage tank is classified into the "EShan" category and in the "EShan, gas gathering and transportation equipment" category. 6.2.7.2 When there is no special category for the technology, installation, test, parts, equipment and other standards for a specific product in the "China Standard Document Classification Method", in principle, they can be classified with the product. Example 1: "Technical conditions for electroplating of white cars" is classified into the "Y Light Industry, Cultural and Living Goods" category and is classified in the "Y11 White Car" category. Example 2: Evaporator of household refrigerators is classified with "Household refrigerators" in the "Y6 Household Air Conditioners and Refrigerator 7" category. Example 3: "General provisions for physical properties test methods of bulk materials in continuous conveying equipment" is classified with "continuous conveying equipment" in the "J81 Conveyor Domain" category. 6.2.8 (Classification of standards published in the form of "part", "volume", etc. with a general standard title, published in the form of "first part" etc.) Series standards should be classified according to the professional category of the general title. In order to facilitate retrieval, the "parts" of the series standards that have independent categories in the classification table shall be supplemented according to their professional contents. Example 1: Microfilm Technology Glossary, Part 3: Film Processing Microfilm Technology Vocabulary Part 5: Image Quality, Readability and Inspection Efficiency Microfilm Technology Vocabulary Part 6: Equipment", according to its main title "Microfilm Technology\Classification" into the "A Comprehensive" category, classified into the "AI4 Library, Archives, Documentation and Information Work" category. And among them, Microfilm Technology Vocabulary: Part 6: Equipment is also classified into the "N47 Microfilm Copying Machinery" category. Example 2: Electrical terminology basic terms electrical terminology meter welding machine falling T terminology cable 3. According to its local title \ Electrical terminology "Classification" into the "K Electrical" category, classified into the "K Basic Standards and Application Methods" category. The term welding machine is also classified into the "machine base" category and the "14 welding and planning equipment" category. The term "electrical engineering" is not classified into the "K electrical engineering" category and is classified into the "K13 cable and its accessories" category. 6.2.9 Classification of standard appendices, supplements, amendments, errata, etc. of standards The appendices, supplements, amendments, errata, etc. of standards are classified with the original standard document: 6.2.10 Category separator
When a standard is classified into multiple categories, multiple classification numbers are separated by a half-width semicolon ",\. Example: The classification number of "Electrical Engineering Cable" in the "Chinese Standard Document Classification" is: K01:K136.3 Classification rules of the international standard classification system
Note: The classification number mentioned in the section is the classification number of the international standard classification system. 6.3.1 Depth of standard classification
The standard should be classified into the second-level category under the corresponding category through comparative analysis between the standard subject and the classification system. If the third-level category has been detailed Example 1: Road vehicles and their connections, types 1A and 1B, classified under 43.080 Road vehicle internal combustion engines, classified under the third level "43.060.50 Gas and air conditioning equipment, control systems" Example 2: Agricultural machinery safety, first level: general requirements, classified under the third level "65.080.01 Agricultural machinery and equipment", not classified under the second level "65.C6C Agricultural machinery, implements and equipment
Example 3: Multi-person anesthesia machines, single-use sterile hypodermic needles, surgical instruments with detachable plates, classified under the following first level "1.040.13 Anesthesia breathing and resuscitation equipment", 11.040.25 Injection, injection needles and catheters, and 11.040.30 Surgical instruments and materials". Not using its higher level category \11.9-9 Medical equipment" (secondary category) for classification: 6.3.2 The classification of general standards for professional categories at all levels. The general basic standards for each secondary category under the major category should be divided into major categories and comprehensive categories. Example 1: The award "13 Road Vehicle Engineering" contains two comprehensive categories "13, Road Vehicle Comprehensive", which are used to classify the basic standards for road vehicle engineering.
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