De or het modelverordening?

The correct Dutch article is:

de modelverordening

Rule Words ending in -ing: almost always de. See the rule

How to use modelverordening

the modelverordeningde modelverordening
this modelverordeningdeze modelverordening
that modelverordeningdie modelverordening
our modelverordeningonze modelverordening
your modelverordeningjouw modelverordening
every modelverordeningelke modelverordening
which modelverordening?welke modelverordening?
a big modelverordening / the big modelverordeningeen grote modelverordening, de grote modelverordening