“…Therefore, this study exploratively set up 10 primary variables and 62 secondary variables, as shown in Table 6. The primary variables are as follows: policy nature [29,51,53] (X1), policy function [56,57] (X2), policy ideas (X3), policy instrument [51,58] (X4), incentives and constraints [31,32] (X5), content evaluation [50,55,56] (X6), policy content [53,57] (X7a), functioning hierarchy [32,50,57] (X7b), participating subjects [31,33] (X8), and implementation guarantee [31,48] (X9). Each of these level 1 variables has a number of level 2 variables, as shown in Table 6.…”