Model source language

The model source language is used for writing and structuring model source code, which can be in the form of a single text file, multiple files, or a string.

The language comprises a number of keywords, each signifying the beginning of a specific section, such as a section declaring the model variable names, or a section defining the model equations. The sections can be arranged in any order, and the same type of section can be repeated multiple times.

Declaring model quantities

Keyword	Description	Simultaneous	Sequential
!variables	Declare endogenous/transition variables
!unanticipated_shocks	Declare unanticipated shocks
!anticipated_shocks	Declare anticipated shocks
!measurement_variables	Declare measurement variables
!measurement_shocks	Declare measurement shocks
!exogenous_variables	Declare exogenous variables
!parameters	Declare parameters

Defining model equations

Keyword	Description	Simultaneous	Sequential
!equations	Define equations
!measurement_equations	Define measurement equations

Special operators inside equations

Operator	Description	Simultaneous	Sequential
{±k}	Time shift (- for lags, + for lead)
!!	Steady-state form of equation
===	Identity sign