HJ 720-2017Metadata specification for environment information (English PDF)

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.

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.

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

6 Metadata item metadata standard

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...