How to change IDA's name representation programmatically?

Question

I've made a custom loader and processor. As I use segment to separate something, now I want my name automatically shows in the following form
9 dseg_1234 the same as 2, but without data type specifier,
which is described in https://www.hex-rays.com/products/ida/support/idadoc/609.shtml
The Java processor and loader can change the name representation to number 9 without any additional settings. However I failed to find any code relating to changing the name representation :(
So how does the Java processor change this option?

Answer 1

Use set_inf_attr with the INF_NAMETYPE index