According to the Detailed Rules for the Implementation of School Enrollment in Compulsory Education in Xinjin District of Chengdu (No.9 [202/KLOC-0]), the legal guardian of the house buyer's children studying in primary schools outside the district must hold the household registration book, birth certificate and housing materials (referring to the real estate title certificate, real estate license or housing information filing form held by the legal guardian in full, both of which are acceptable).