It means they will go to school as required. Not practice a law other than the one the country imposes. They will integrate into neighborhoods and not cluster together staying homogenous, not learning the language, and expecting everyone to follow their way even though they are guests.
Well, I mean, they're not guests. They're citizens. That's kind of a prerequisite for integrating them. If you view them as outsiders who are in Germany on sufferance, you should probably assume that they will never integrate to your standards. What would be the point? Integration might change their perspective, but it won't change yours.
And your other points are pretty silly as well. Are they going to cluster together? Yeah, probably. They're Levantine Muslims in a predominantly Teutonic Christian country. And, I mean, don't take this the wrong way, but Germans don't exactly have a reputation for sterling acceptance of others (not to mention this entire thread).
When minority groups fear abuse and disenfranchisement, they form ethnic enclaves, speak in their own language, and build communities where they can support each other without depending on the existing power structures -- because they can't trust them. So you should assume that they will do all of those things. Mainly for the same reasons that you're telling them not to do them.