だとする、うえで、よう in this sentence


> 総会のあと、公明党大阪府本部の佐藤代表は、記者団に対し、都構想そのものへの賛否は白紙 **だとしたうえで**
> 、「法定協議会が再開されれば、いい協定書を作れる **よう** 前向きに協力していくというのがわれわれのスタンスだ」と述べました。
> ([source](https://www3.nhk.or.jp/news/html/20190511/k10011912861000.html))

Here is my attempted translation:

> After the general meeting, the representative of the New Komeito Party Osaka
> Prefecture Administration, Mr. Sato, told to reporters, when **assuming**
> the opinions on both sides towards the Metropolis Plan have not been made,
> "If the statutory committee is reopened, our stance is that we will
> positively cooperate together to make a good agreement".

What does だとした mean? From what I know, だとする could mean "assuming that, when
used with a noun"

> 彼の死は事故 **だとする** 君の推定は間違っているようだ。  
>  Your **assumption** that his death was an accident seems to be wrong.
>
> 病院は頭痛の原因を睡眠不足 **だとした** 。  
>  The hospital **assumed** the cause of the headache to be a lack of sleep.

But I'm not sure if this interpretation is correct for that sentence.

Also, is うえで the same type of 上で like in this example?

> これまた西欧文明を理解する **うえで** 、忘れてはならないことでありましょう。 Again, let's not forget this
> **when** trying to understand Western European civilization.

I translated it as "when"

And lastly, what does the **よう** in いい協定書を作れる **よう** 前向きに協力していく mean? I
assumed it was ように but I never seen it without the に before. Like in this
sentence:

> 風邪を引かない **ように** ちゃんと寝てください。Get some sleep so you don't catch a cold.

* * *

Here are my questions:

  1. Is my interpretation of だとする correct?

  2. Is my interpretation of うえで correct?

  3. What does よう mean?




You understand everything correctly. There is no such thing as だとする. It's とする
and だ is just there because there was a noun. If it was a verb or adjective
you'd just use とする. And following this, obviously you can conjugate it.

Noun particles(?) like 為{ため}、様{よう}、余{あま}り, don't necessarily need に after them
to function.

