“…A portion of the HLPN model shown in Figure 3 is depicted in Figure 4, which represents the registration process of domains on the DS. ∶= sp-cr [10], sp-r [2] ∶= sp-cr [11], sp-r [3] ∶= sp-cr [12], sp-r [4] ∶= sp-cr [13], sp-r [10] ∶= sp-cr [14], sp-r [13] ∶= sp-cr [9], sp-r [25] ∶= sp-cr [24], sp-r [11] ∶= CR − REG − DID (sp-cr [17], sp-cr [10]), sp-r [12] ∶= CR − REG − SK (sp-cr [17], sp-cr [10]), sp-cr [15] ∶= sp-r [11], sp-cr [16] ∶= sp-r [12], sp-ua [1] ∶= sp-r [11], sp-ua [2] ∶= sp-r [12], Sp − Cr ′ = Sp − Cr ∪ (sp-cr [15], sp-cr [16]) ∧ Sp − R ′ = Sp − R ∪ (sp-r [1], sp-r [2], sp-r [3], sp-r [4], sp-r [10], sp-r [13], sp-r [11], sp-r [12], sp-r [25]…”