Function graphannis_capi::data::annis_vec_qattdesc_get_variable

#[no_mangle]pub extern "C" fn annis_vec_qattdesc_get_variable(
    ptr: *const Vec<QueryAttributeDescription>, 
    i: size_t
) -> *mut c_char

Create a string representing the variable part of the query attribute description.

The resulting char* must be freeed with annis_str_free!