Can we have the following codes in the Dynare: a= E(t) (b(t)/𝝮(t))+x+y+…

Hi all.
Can we have the following codes in the Dynare: a= E(t) (b(t)/𝝮(t))+x+y+…
E is expectation and 𝝮 is Information set
In an article; I observed such Linear equation:
image

Thank you

That depends on what exactly the information set consists of. Which article is it?