Basic usage of Argo WorkflowTemplates, with minimal duplication and boiler plate. The DAG is the only template, using inline sub-templates for tasks (instead of additional task templates), and a single global parameter passed by Workflow at top level (without having redefine the DAG structure to pass separate parameters)

template.yml

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
  name: workflow-template-submittable
spec:
  entrypoint: dag
  templates:
    - name: dag
      inputs:
        parameters:
          - name: global-parameter
      dag:
        tasks:
        - name: A
          inline:
            container:
              image: docker/whalesay
              command: [cowsay]
              args: ["hello A"]
        - name: B
          depends: "A"
          inline:
            container:
              image: docker/whalesay
              command: [cowsay]
              args: ["{{inputs.parameters.global-parameter}}"]

workflow.yaml

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: workflow-template-hello-world-
  namespace: processing
spec:
  arguments:
    parameters:
      - name: global-parameter
        value: "from workflow"
  workflowTemplateRef:
    name: workflow-template-submittable