Macro impl_performance_entry_struct 

macro_rules! impl_performance_entry_struct {
    ($binding:ident, $struct:ident, $type:path,
        { $( $(#[$attr:meta])* $field_name:ident : $field_type:ty, ),* } // Arguments
    ) => { ... };
}

DOM struct implementation for simple interfaces inheriting from PerformanceEntry.