diff --git a/src/amr.it b/src/amr.it
index b5ead00..f9aa5a2 100644
--- a/src/amr.it
+++ b/src/amr.it
@@ -15,12 +15,12 @@ end
 
 
 @sum Distribution begin
-  StandardUniform(str::String)
+  StandardUniform()
   Uniform(min::Float64, max::Float64)
-  StandardNormal(str::String)
+  StandardNormal()
   Normal(mean::Float64, variance::Float64)
   PointMass(value::Float64)
-  Undefined(str::String)
+  Undefined()
 end
 
 struct Observable
@@ -37,11 +37,6 @@ end
   Time(id::Symbol, units::Unit)
 end
 
-struct Pair
-  first::Symbol
-  second::Symbol
-end
-
 @sum Note begin
   Name(str::String)
   Description(str::String)
diff --git a/src/amr.jl b/src/amr.jl
index b3f0ec0..e698c99 100644
--- a/src/amr.jl
+++ b/src/amr.jl
@@ -19,7 +19,6 @@ using ..SyntacticModelsBase
 @intertypes "amr.it" module amr end
 
 using .amr
-import .amr: Pair
 
 nomath = Math("")
 
@@ -28,7 +27,7 @@ nounit = Unit("", nomath)
 @data Semantic <: AbstractTerm begin
   ODEList(statements::Vector{Expression})
   ODERecord(rates::Vector{Rate}, initials::Vector{Initial}, parameters::Vector{Parameter}, time::Time)
-  Typing(system::ACSetSpec, map::Vector{Pair})
+  Typing(system::ACSetSpec, map::Vector{Base.Pair})
 end
 
 
@@ -189,8 +188,8 @@ end
 
 function load(::Type{Distribution}, d::AbstractDict)
   @match d begin
-    Dict("type"=>"StandardUniform1")           => StandardUniform
-    Dict("type"=>"StandardNormal")             => StandardNormal
+    Dict("type"=>"StandardUniform1")           => StandardUniform()
+    Dict("type"=>"StandardNormal")             => StandardNormal()
     Dict("type"=>"Uniform", "parameters"=>p)   => Uniform(p["minimum"], p["maximum"])
     Dict("type"=>"Uniform1", "parameters"=>p)  => Uniform(p["minimum"], p["maximum"])
     Dict("type"=>"Normal", "parameters"=>p)    => Normal(p["mu"], p["var"])
@@ -198,7 +197,7 @@ function load(::Type{Distribution}, d::AbstractDict)
   end
 end
 
-load(::Type{Distribution}, ::Nothing) = PointMass(missing)
+load(::Type{Distribution}, ::Nothing) = Undefined()
 
 function load(::Type{Note}, d::AbstractDict)
   @match d begin
@@ -221,7 +220,7 @@ function load(::Type{Parameter}, d::AbstractDict)
     u,
     d["value"],
     load(Distribution, get(d,"distribution", nothing))
-    )
+  )
 end
 
 function load(::Type{ODERecord}, d::AbstractDict)
diff --git a/src/askemdecapodes.it b/src/askemdecapodes.it
index 01d68dc..df3f910 100644
--- a/src/askemdecapodes.it
+++ b/src/askemdecapodes.it
@@ -1,4 +1,4 @@
 @sum ASKEMDeca begin
-  ASKEMDecaExpr(header::amr.Header, model::decapodes.DecaExpr, annotations::Vector{amr.Annotation{Symbol,Symbol}})
-  ASKEMDecapode(header::amr.Header, model::decapodes.SummationDecapode, annotations::Vector{amr.Annotation{Symbol,Symbol}})
+  ASKEMDecaExpr(header::amr.Header, model::decapodes.DecaExpr, annotations::Vector{amr.Annotation})
+  ASKEMDecapode(header::amr.Header, model::decapodeacset.SymSummationDecapode, annotations::Vector{amr.Annotation})
 end
diff --git a/src/decapodes.jl b/src/decapodes.jl
index bd0242b..b6f9753 100644
--- a/src/decapodes.jl
+++ b/src/decapodes.jl
@@ -18,6 +18,7 @@ import DiagrammaticEquations: decapodes, decapodeacset
 end
 
 using .askemdecapodes
+using .askemdecapodes: ASKEMDecaExpr, ASKEMDecapode
 
 @doc """    ASKEMDeca
 
diff --git a/test/core.jl b/test/core.jl
index 55f9996..a0c1144 100644
--- a/test/core.jl
+++ b/test/core.jl
@@ -1,7 +1,5 @@
-include("../src/SyntacticModels.jl")
-
-using .SyntacticModels
-using .SyntacticModels.ASKEMDecapodes
+using SyntacticModels
+using SyntacticModels.ASKEMDecapodes
 
 using Test
 using JSON3
@@ -35,4 +33,4 @@ include("amr_examples.jl")
 include("decapodes_examples.jl")
 include("uwd_examples.jl")
 include("composite_models_examples.jl")
-include("serialization_mwe.jl")
\ No newline at end of file
+include("serialization_mwe.jl")