It is very complicated and complex. It regulates the birth, marriage, and divorce. There was no clear explanation about such limitation, nonetheless. Of course, it was in connection with racial interest. Citizenship-certificate is treated only for Chinese ethnic, not for other ethnics.
Civil registration is one of the examples.
It is the examples of racism in a vertical manner. Racism in the horizontal manner, and the most dangerous one, are conflicts between ethnic and religious groups. These conflicts often tend to destruction and violence. Our country has many experiences of horizontal conflicts, such as, between ethnic Madura, Melayu and Dayak, which occurred in 1997-1998. Tens of thousands of people have been suffering.