--- a/src/SbpOperators/volumeops/quadratures/quadrature.jl	Sun Feb 07 21:16:40 2021 +0100
+++ b/src/SbpOperators/volumeops/quadratures/quadrature.jl	Sat Feb 13 16:05:02 2021 +0100
@@ -1,36 +1,29 @@
 """
-    Quadrature(grid::EquidistantGrid, inner_stencil, closure_stencils)
+    quadrature(grid::EquidistantGrid, closure_stencils, inner_stencil)
+    quadrature(grid::EquidistantGrid, closure_stencils)
 
 Creates the quadrature operator `H` as a `TensorMapping`
 
-The quadrature approximates the integral operator on the grid using
+`H` approximiates the integral operator on `grid` the using the stencil
 `inner_stencil` in the interior and a set of stencils `closure_stencils`
-for the points in the closure regions.
+for the points in the closure regions. If `inner_stencil` is omitted a central
+interior stencil with weight 1 is used.
 
 On a one-dimensional `grid`, `H` is a `VolumeOperator`. On a multi-dimensional
 `grid`, `H` is the outer product of the 1-dimensional quadrature operators in
 each coordinate direction. Also see the documentation of
-`SbpOperators.volume_operator(...)` for more details.
+`SbpOperators.volume_operator(...)` for more details. On a 0-dimensional `grid`,
+`H` is a 0-dimensional `IdentityMapping`.
 """
-function Quadrature(grid::EquidistantGrid{Dim}, inner_stencil, closure_stencils) where Dim
+function quadrature(grid::EquidistantGrid, closure_stencils, inner_stencil = CenteredStencil(one(eltype(grid))))
     h = spacing(grid)
     H = SbpOperators.volume_operator(grid, scale(inner_stencil,h[1]), scale.(closure_stencils,h[1]), even, 1)
-    for i ∈ 2:Dim
+    for i ∈ 2:dimension(grid)
         Hᵢ = SbpOperators.volume_operator(grid, scale(inner_stencil,h[i]), scale.(closure_stencils,h[i]), even, i)
         H = H∘Hᵢ
     end
     return H
 end
-export Quadrature
-
-"""
-    DiagonalQuadrature(grid::EquidistantGrid, closure_stencils)
+export quadrature
 
-Creates the quadrature operator with the inner stencil 1/h and 1-element sized
-closure stencils (i.e the operator is diagonal)
-"""
-function DiagonalQuadrature(grid::EquidistantGrid, closure_stencils::NTuple{M,Stencil{T,1}}) where {M,T}
-    inner_stencil = Stencil(one(T), center=1)
-    return Quadrature(grid, inner_stencil, closure_stencils)
-end
-export DiagonalQuadrature
+quadrature(grid::EquidistantGrid{0}, closure_stencils, inner_stencil) = IdentityMapping{eltype(grid)}()