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HJ 720-2017: Metadata specification for environment information
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HJ 720: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
HJ 720-2017English1089 Add to Cart 7 days [Need to translate] Metadata specification for environment information Valid HJ 720-2017
HJ 720-2014EnglishRFQ ASK 3 days [Need to translate] Environment information metadata specification Obsolete HJ 720-2014

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Standard similar to HJ 720-2017

HG/T 5871   GB/T 27611   GB/T 20861   HJ 710.11   HJ 710.1   HJ 710.10   

Basic data

Standard ID HJ 720-2017 (HJ720-2017)
Description (Translated English) Metadata specification for environment information
Sector / Industry Environmental Protection Industry Standard
Classification of Chinese Standard Z04
Classification of International Standard 13.020
Word Count Estimation 47,449
Date of Issue 2017-11-28
Date of Implementation 2018-01-01
Older Standard (superseded by this standard) HJ 720-2014
Quoted Standard GB/T 2260; GB/T 7408; HJ/T 417-2007
Regulation (derived from) MEP Announcement 2017 No. 61
Issuing agency(ies) Ministry of Ecology and Environment
Summary This standard specifies the framework of the environmental information metadata standard. There are 11 management items for the object class, characteristics, classification scheme, value range, data element concept, data element, data set specification, terminology, indicator, data set, and quality statement. The data is regulated. This standard applies to the management of environmental information metadata standards, the construction of environmental information resources directory, the development of the national minimum data set, the compilation of data dictionary, and the design and development of environmental information metadata registration systems.

HJ 720-2017: Metadata specification for environment information

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Environmental Information Metadata Specification) People's Republic of China national environmental protection standards Replacing HJ 720-2014 Environmental Information Metadata Specification Metadata specification for environment information 2017-11-28 Posted 2018-01-01 implementation Ministry of Environmental Protection released Directory Foreword ..ii 1 scope of application .1 2 Normative references 1

3 Terms and definitions

4 Environmental Information Metadata standard framework .3 5 Describe the convention .3 Metadata standard for 6 metadata items Appendix A (Normative) Metadata values Domain Attributes Specification Appendix B (Informative) Examples of metadata representation of managed objects .35

Foreword

In order to carry out the "Law of the People's Republic of China on Environmental Protection", promote environmental information work, and ensure the interconnection and sharing of environmental information, Fan environmental information and metadata standards, the development of this standard. This standard specifies the environmental information metadata standard framework for object classes, characteristics, classification schemes, range, concept of data elements, data elements, Dataset specifications, terms, indicators, data sets, quality claims a total of 11 items of metadata management has been standardized. This standard was first released in.2014, this time for the first time. The main content of this revision. - Management objects are expanded from datasets to object classes, features, classification schemes, ranges, concepts of data elements, data elements, dataset specifications, Terminology, indicators, data sets, quality statement a total of 11 management items; - adjusted metadata attributes of the data set; - Adjusted appendix content. This standard Appendix A normative appendix, Appendix B is an informative annex. This standard is formulated by the General Office of the Ministry of Environmental Protection and the Scientific and Technical Standards Department. The main drafters of this standard. MEP Information Center, MEP Environmental and Economic Policy Research Center. This standard was approved by the MEP on November 28,.2017. This standard since January 1,.2018 come into operation. This standard is interpreted by the MEP. Environmental Information Metadata Specification

1 scope of application

This standard specifies the environmental information metadata standard framework for object classes, characteristics, classification schemes, range, concept of data elements, data elements, Dataset specifications, terms, indicators, data sets, quality claims a total of 11 items of metadata management has been standardized. This standard applies to the management of environmental information metadata standards, environmental information resources directory construction, the development of national minimum data set, data Meta-dictionary preparation and environmental information metadata registration system design and development.

2 Normative references

This standard references the following documents in the terms. For undated references, valid versions (including amendments) apply to this standard quasi. GB/T 2260 People's Republic of China administrative divisions code GB/T 7408 data elements and exchange format information exchange date and time notation HJ/T 417 Environmental Information Classification and Codes

3 Terms and definitions

The following terms and definitions apply to this standard. 3.1 environmental information environmental information Environmental management, environmental science, environmental technology, environmental protection industry and other environmental protection-related data, instructions and signals, etc., and its Related dynamic changes of information, including text, numbers, symbols, graphics, images, video and sound and other expressions. [HJ/T 416-2007, terms and definitions 3.1] 3.2 data data A formal, re-interpretable representation of information that is suitable for communication, interpretation, or processing. [GB/T 5271.1-2000, Definition 01.01.02] 3.3 data element data element A unit of data specifying the definition, identification, representation, and tolerance of a set of attributes. [GB/T 18391.1-2009, terms and definitions 3.3.8] 3.4 metadata metadata Data that defines and describes other data. [GB/T 18391.1-2009, terms and definitions 3.2.16] 3.5 concept concept Knowledge unit through a unique combination of features. [GB/T 15237.1-2000, definition 3.2.1] 3.6 Definition definition Describe a concept, and different from other related concepts of the statement. [GB/T 15237.1-2000, Definition 3.3.1] 3.7 Metadata object metadata object An object type defined by the metadata standards framework is an object that needs to be included in metadata specification management. This standard includes the object class, Characteristics, classification scheme, range, data element concept, data element, data set, data set specification, indicator, data quality statement, term common 11 metadata objects. [GB/T 18391.1-2009, terminology 3.2.18 The definition of a metadata object is "an object type defined by a metamodel," in order to For ease of understanding, the meta-model is modified to the metadata standard framework in this standard and further explained. ] 3.8 object class object class Its boundaries and meanings can be clearly identified, and concepts and abstractions that follow the same rules as the nature and behavior of the real world Collection of business. [GB/T 18391.1-2009, terms and definitions 3.3.22] 3.9 Properties property Common to all members of an object class. [GB/T 18391.1-2009, terms and definitions 3.3.29] 3.10 for representation The range of data elements, the combination of data types, including, if necessary, the unit of measure or character set. [GB/T 18391.1-2002, terms and definitions 3.60] 3.11 representation class representation class Represents the type of classification. [GB/T 18391.1-2009, terms and definitions 3.3.35] 3.12 classification scheme classification scheme Descriptive information that arranges or groups objects based on their common characteristics. [GB/T 18391.1-2009, terms and definitions 3.3.4] 3.13 value The value of the data. [GB/T 18391.1-2009, terms and definitions 3.3.37] 3.14 Allowed values permissible value The expression of the meaning of a value allowed in a particular value range. [GB/T 18391.1-2009, terms and definitions 3.3.28] 3.15 value domain value domain A collection of allowed values. [GB/T 18391.1-2009, terms and definitions 3.3.38] 3.16 Value Meaning value meaning The meaning of a value or semantic content. [GB/T 18391.1-2009, terms and definitions 3.3.39] 3.17 Unit of measure < Range> Actual unit for measuring related values. [GB/T 18391.1-2009, terms and definitions 3.3.36] 3.18 data element concept data element concept The concept that can be expressed in the form of data elements, the description of which is independent of any particular notation. [GB/T 18391.1-2009, terms and definitions 3.3.9] 3.19 dataset dataset A collection of data that has a certain theme, can be identified and can be computerized. [WS/T 305-2009, Terminology and abbreviations 3.1.1] 3.20 Dataset specification dataset specification Specific business activities Stakeholders unanimously agree on the data elements to be collected and their standardization. 3.21 attribute attribute The characteristics of an object or entity. [GB/T 18391.1-2009, terms and definitions 3.1.1]

4 environmental information metadata standard framework

The environmental information metadata standard framework is built around two aspects of "data collection standardization" and "data sharing application". First, from Paul The standardization of barrier data acquisition needs to set seven kinds of metadata objects, which are object class, feature, classification scheme, concept of data element, value Domain, Data Element, Dataset Specification. Secondly, from the perspective of serving the data sharing application, we set up three kinds of metadata objects, which are indicators, Data set, quality statement. At the same time, the term is registered as a separate metadata item. Environmental information metadata standard framework as shown 1 shown. Data set specification Data element Data Element Concept Range Object class characteristics classification scheme index data set Quality Statement the term Figure 1 Environmental Information Metadata Standards Framework Object class and characteristics constitute the concept of data elements, according to the classification scheme can be developed value range, the concept of data elements and the value of domain data elements, a number of Data elements make up the data set specification. Indicators can be a specific data element can also be calculated by different data elements. Data set specification and data set can be Include metrics, or include data elements for index calculations. The metadata specification of indicators can be used to establish the concept of indicators that have a consistent understanding, Calculation methods, evaluation criteria and presentation. The quality statement is the conclusion of the quality evaluation of the specific data set from different dimensions, which can provide users of the data set with more Off the data quality of the situation. Terminology is a detailed explanation of a concept of private or ambiguous concepts that can be linked to any metadata item in which the term has been quoted. The metadata specification of terms can be used to establish the notion of terms that have a consistent understanding.

5 description of the agreement

5.1 Property Descriptors Metadata standards are formed by normalizing the relevant attributes of each type of metadata object. Attribute descriptors are pairs of metadata items Properties of the standard description of the entry, the standard contains a total of name, definition, constraints, conditions, the value of the field, the number of occurrences, the type of data, the most Large length, a total of nine notes, the specific items and constraints shown in Table 1. Table 1 Metadata Item Attribute Descriptor Entries and Constraints Attribute Descriptor Entry Constraints 1 Attribute Descriptor Entry Constraints 1 Name M The number of occurrences M Define M data type M Constraint M maximum length O Condition C Remark O Value range O Note 1. "Constraints" indicate whether the attribute descriptor entry is Mandatory (M), Condition Condition (C), or Option (O) 5.2 Attribute Descriptors Entries apply rules 5.2.1 Name The "name" attribute descriptor is a tag that gives the metadata item properties. "Name" should be unique, with Chinese characters, letters, numbers, symbols and so on String representation. 5.2.2 Definition The "definition" attribute descriptor is a conceptual interpretation of a metadata item attribute descriptor such that one metadata item attribute is related to other metadata items Sex difference. "Definition" is a string of characters, letters, numbers, symbols and other forms. 5.2.3 Constraints The Constraint attribute descriptor gives a constraint that a metadata item attribute appears (ie contains a value). Have the following meanings. - Mandatory (M). This metadata item attribute must appear; - Condition Selection (C). If a specified condition exists, the metadata item attribute appears; - Optional (O). This metadata item property may or may not appear. 5.2.4 Conditions The "condition" attribute descriptor gives the premise and requirement of the appearance of the metadata item, and uses the characters such as Chinese characters, letters, numbers, symbols, etc. Form that. 5.2.4 Range The Range attribute descriptor is a range of values that specifies the metadata element. 5.2.5 Occurrences The "Occurrences" attribute descriptor is the number of times metadata attributes and attribute values can be present in a metadata specification. Note. The attribute descriptor has the following four conditions. "0. 1" (that does not appear or appear once), "0. n" (that does not appear or most Appear more than n times), "1. 1" (appears and appears only once), "1. n" (at least once or up to n times). 5.2.6 data type The "data type" attribute descriptor is a descriptor of a specific set of values specified for expressing attribute values. An example of the data type of the attribute value is String, Numeric, Date, Logical. 5.2.7 Maximum length The "maximum length" attribute descriptor is the maximum number of bits the storage unit can express a specified value. The maximum length is expressed in numbers. Example. When the "data type" instance is specified as "numeric" and the "maximum length" descriptor instance value is "6", the table The attribute value can contain up to 6 digits. 5.2.8 Remarks The Remarks property descriptor is a comment about the property application. Remarks to Chinese characters, letters, numbers, symbols and other forms of string representation.

6 metadata item metadata standard

6.1 Overview Attributes of the metadata items include identification class, declaration class, definition class, relational class, presentation class, content class, distribution class, data quality class, There are 13 kinds of coverage categories, restricted categories, maintenance categories, management categories and additional categories. Table 2 shows the contents of each category and applicable management items. Table 2 Description of the metadata items No. Attribute Type Attribute Contents Applicable management items

1 identification class

Identity classes contain basic information, content packages that uniquely identify the metadata item Including English name, identifier, metadata item type, submitted to the agency Object class, feature, classification scheme, range, data element outline Reading, Data Element, Dataset Specification, Terminology, Indicators, Number According to the set, the quality statement

2 statement class

Data set of data quality claims, including the authenticity of the data, Timeliness, accuracy, validity, representation, availability, etc. Quality Statement

3 Define the definition of a class metadata item and the metadata items that make up the metadata item

Object class, feature, classification scheme, range, data element outline Reading, data elements, terms, indicators 4 relations between different types of metadata items include, constitute the relationship between Object class, feature, classification scheme, range, data element outline Reading, Data Element, Terms, Dataset Specification, Indicator, Number According to the set, the quality statement

5 for the class

Representation of metadata items, including the type, data type, Said format, maximum and minimum length, allowable value, unit of measure and so on Value range, data element, indicator

6 content category

Provide descriptive information about dataset content features, including abstracts, features Data element and so on Data set specification, data set

7 Coverage category

Provide a description of the data coverage, including spatial van Wai, time range and so on data set

8 distribution class

Contains information about the publisher of the data set and the user's access to resources Way data set

9 Data Quality Data Producer General Description Data Set on Data Set Data Quality

10 Restricted class data sets security restrictions hierarchical information data sets 11 Maintenance class data set update frequency information data set 12 Management class Registered party including metadata, registration status and registration date Object class, feature, classification scheme, range, data element outline Reading, Data Element, Dataset Specification, Terminology, Indicators, Number According to the set, the quality statement 13 additional classes Other information related to metadata items can be either textual or Link form, including sampling and monitoring methods, project implementation Programs, data collection tables, database description and so on Data element 6.2 Metadata items common attributes 6.2.1 Common Attributes The basic attributes of each management item are different, but all have three common attributes. identification, relation and management. If different metadata items Setting the same property is described only the first time the property appears. The common attributes of metadata items are shown in Table 3. Table 3 Common Attributes of Metadata Items Attribute Type Attribute Name Constraint Identification class Chinese name M English name M Identifier M Version M Metadata item type M Submitting Organization M Relationships Related Terms Management class Registration Authority Registration status M Registration date M 6.2.2 Identify class attributes 6.2.2.1 Chinese name Name. Chinese name Definition. A reference to a Chinese term given to a metadata item Constraints. Required Occurrences. 1. 1 Data Type. String Range. Free text 6.2.2.2 English name Name. English name Definition. The allegation of an English word given to a metadata item Constraints. Required Occurrences. 1. 1 Data Type. String Range. Free text 6.2.2.3 Identifier Name. Identifier Definition. A unique identifier of a metadata item in a registry that is language neutral Constraints. Required Occurrences. 1. 1 Data Type. String Value range. Free text, the system automatically generates, composed of capital letters and numbers, the generation rules are as follows. The first two are the abbreviations for the environment "HJ "; the middle part is the English name of 11 kinds of metadata; the latter part is "eight dates (YYYYMMDD) Six-digit time (HHMMSS) Milliseconds (MS, less than three digits are filled with zeroes) "For example, the designation of an object class Character is "HJ OBJECT20130601093025367". English name of the 11 kinds of metadata are. Object class "OBJECT", characteristics "PROPERTY", concept of data element "CONCEPT", classification scheme "CLASSFICATION", range "RANGE", data element ELEMENT, Dataset Specification NORM, Indicator KPI, Dataset DATASETS, QUALITY QUALITY Statement, The term "TERM" 6.2.2.4 version Name. Version Definition. The standard issued by a metadata item in a series of well-established metadata item standards in a registry Constraints. Required Occurrences. 1. 1 Data Type. Value Value range. real number, such as "environmental pollution source category classification scheme" version is 1.0. Category programs appear to have major changes when the version of The integer part changes; when the change is small, the fractional part changes 6.2.2.5 Metadata item type Name. The type of metadata item Definition. Used to represent the type of metadata item Constraints. Required Occurrences. 1. 1 Data Type. String Value range. free text, Appendix A Table A.1 gives the standard metadata item type 6.2.2.6 Submitting Organization Name. Submitting Organization Definition. One or more organizations responsible for submitting metadata items as national standards Constraints. Required Occurrences. 1. n Data Type. String Range. Free text 6.2.3 Relationship class properties Related terms Name. Related terms Definition. A term referenced during creation of a metadata item Constraints. optional Occurrences. 0. n Data Type. String Range. Free text 6.2.4 Management class properties 6.2.4.1 Registration Authority Name. Registration Authority Definition. An organization authorized to register a metadata item Constraints. Required Occurrences. 1. 1 Data Type. String Range. Free text 6.2.4.2 Registration status Name. Registration Status Definition. A state of a metadata item during its lifetime of registration Constraints. Required Occurrences. 1. 1 Data Type. String Value range. free text, Appendix A Table A.2 shows the registration status of the national institutions of this standard 6.2.4.3 Registration Date Name. Registration Date Definition. The date the registration status of the metadata item will take effect, in the format YYYY-MM-DD Constraints. Required Occurrences. 1. 1 Data Type. Date Value range. According to GB/T 7408 implementation, the format is YYYY-MM-DD 6.3 Object Class Properties 6.3.1 metadata content Object class metadata includes four types of attributes. identification class, definition class, relationship class, management class. Various properties described in detail in Table 4, examples See Appendix B, Table B.1. Table 4 object class attributes Attribute Type Attribute Name Constraint Identification class Chinese name M English name M Identifier M Version M Metadata item type M Submitting Organization M Object Class Category M Define the class definition M Relationships Related terms Related Data Element Concept Management class Registration Authority Registration status M Registration date M 6.3.2 Special attributes 6.3.2.1 Identify class attributes Name. Object Class Category Definition. A subclass of an object class by a feature Constraints. Required Occurrences. 1. 1 Data Type. String Value range. free text, Appendix A Table A.3 gives the standard object class categories 6.3.2.2 Define class attributes Name. Definition Definition. A description of a concept, and different from other related concepts of the statement Constraints. Required Occurrences. 1. 1 Data Type. String Range. Free text 6.3.2.3 Relationship class properties Name. Related Data Element Concepts Definition. What metadata element concepts appear in metadata items Constraints. optional Occurrences. 0. n Data Type. String Range. Free text 6.4 Attributes Attributes 6.4.1 metadata content Attribute metadata includes four types of attributes. identification class, definition class, relationship class, management class. A detailed description of the various attributes in Table 5, examples See Appendix B, Table B.2. Table 5 Attributes of attributes Attribute Type Attribute Name Constraint Identification class Chinese name M English name M Identifier M Version M Metadata item type M Submitting Organization M Feature category M Define the class definition M Relationships Related terms Related Data Element Concept Management class Registration Authority Registration status M Registration date M 6.4.2 Special attributes 6.4.2.1 Identify class attributes Name. Feature Category Definition. According to a certain classification, the formation of a group of similar characteristics of the collection Constraints. Required Occurrences. 1. 1 Data Type. String Range. Free text, Appendix A Table A.4 shows the characteristics of this standard categories 6.4.2.2 Define class attributes The description of the definition attribute refers to the description of the attribute of the object class. 6.4.2.3 Relationship class properties The description of the related data element conceptual attributes refers to the attribute description of the object class. 6.5 classification scheme attributes 6.5.1 metadata content Classification scheme metadata includes four types of attributes. identification class, definition class, relationship class, management class. A detailed description of various attributes is shown in Table 6, Examples are given in Appendix B, Table B.3. Table 6 attributes of the classification scheme Attribute Type Attribute Name Constraint Identification class Chinese name M English name M Identifier M Version M Metadata item type M Submitting Organization M Classification principle M Define the class definition M Relationships Standard reference O Related terms Correlation range Management class Registration Authority Registration status M Registration date M 6.5.2 Special attributes 6.5.2.1 Identify class attributes Name. classification principle Definition. The classification scheme in the classification follow the principle Constraints. Required Occurrences. 1. 1 Data Type. String Range. Free text 6.5.2.2 Define class attributes The description of the definition attribute refers to the description of the attribute of the object class. 6.5.2.3 Relationship class properties a) Standard reference Name. Standard Reference Definition. The standard to which metadata items are referenced in the development process Constraints. optional Occurrences. 0. n Data Type. String Range. Free text b) Correlation range Name. Correlation range Definition. A range of values based on this metadata item Constraints. optional Occurrences. 0. n Data Type. String Range. Free text 6.6 Range Properties 6.6.1 metadata content Value do...

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