diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
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+# Check the syntax, semantics and layout of the DDLm reference dictionary.
+#
+# Note, that the reference dictionary is validated against itself therefore
+# an additional external checkout of the DDLm repository is not needed. 
+
+name: CIF Syntax and Style Check
+
+# Controls when the action will run. Triggers the workflow on push or pull
+# request events but only for the main branch
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '.github/**'
+
+  pull_request:
+    branches:
+      - main
+    paths-ignore:
+      - '.github/**'
+
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  syntax:
+    name: Syntax
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      # Check syntax of all CIF files
+      - name: Check CIF syntax
+        uses: COMCIFS/cif_syntax_check_action@master
+        id: cif_syntax_check
+
+  semantics:
+    name: Semantics
+    runs-on: ubuntu-latest
+    needs: syntax
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Checkout enumeration templates
+        uses: actions/checkout@v4
+        with:
+          repository: COMCIFS/Enumeration_Templates
+          path: cif-dictionaries/Enumeration_Templates
+
+      - name: Run dictionary validity checks
+        uses: COMCIFS/dictionary_check_action@main
+        id: ddlm_check
+
+  layout:
+    name: Layout
+    runs-on: ubuntu-latest
+    needs: syntax
+
+    steps:
+      - name: Get the cache
+        uses: actions/cache@v4
+        id: cache
+        with:
+          path: ~/.julia
+          key: ${{ runner.os }}-julia-v2
+
+      - name: Install Julia
+        uses: julia-actions/setup-julia@v2
+        with:
+          version: '1.10'
+
+      - name: Install Julia packages
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: |
+          julia -e 'import Pkg;Pkg.add("CrystalInfoFramework");Pkg.add("Lerche");Pkg.add("ArgParse")'
+
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          path: main
+
+      - name: Checkout julia tools
+        uses: actions/checkout@v4
+        with:
+          repository: jamesrhester/julia_cif_tools
+          path: julia_cif_tools
+
+      - name: Checkout enumeration templates
+        uses: actions/checkout@v4
+        with:
+          repository: COMCIFS/Enumeration_Templates
+          path: enum
+
+      - name: Move template files to the expected location
+        run: |
+          mv enum/templ_enum.cif main/templ_enum.cif
+
+      - name: Run diagnostics
+        run: |
+          ls -a
+          pwd
+          which julia
+
+      - name: Run dictionary layout checks
+        run: |
+          julia -e 'using Pkg; Pkg.status()'
+          for file in main/*.dic
+          do
+            echo "Checking $file"
+            julia -O0 ./julia_cif_tools/linter.jl -i $PWD/main $file $PWD/main/ddl.dic
+            if [ $? != 0 ]
+            then
+              exit 1 ;
+            fi
+          done