Table 2 Metadata Database Information.

UID

A Unique Identifier (UID) is employed to distinguish individual policies and establish a mapping between the metadata database and specific policies. The UID is composed of two segments: the first part indicates the year of archiving, and the second part denotes a sequential number. For example, the UID “201317437” signifies that the policy was archived in the year 2013 and is the 17,437th entry in the overall sequence.

URL

A URL is the web address that points to the exact location of a policy document online. It is used to direct users to the specific web page where they can access the full text of the policy document.

Year

This refers to the calendar year during which a policy is officially enacted or promulgated by the governing body.

Policy Title

This denotes the formal name given to a policy document that succinctly describes its main focus or subject matter. The title serves as an identifier and provides insight into the scope and intent of the policy without having to read the entire document.

Policy Title in Chinese

Given the target audience is English-speaking but the subject matter is in Chinese, this term would refer to the exact translation of the policy’s title from Chinese to English.

Category-I

From a policy science perspective, categorizing policies can be done based on the regulatory approach they adopt. Here we propose three categories: Command-and-Control Instrument (CCI), Market-based and mixed Instrument (MXI), and Voluntary Instrument (VOI).

Category-II

This classification is based on a lexicon system designed to match the most potentially relevant sub-dimensions with policy content. It serves as an introductory guide for further quantitative analysis in a specific field. Such as policy Implementation Plan of China Green Lighting Project could be categorized as Mitigation_Buildings_Efficient Lighting, Appliances And Equipment with unique code 132.