add nextflow d30e48d

nextflow/docs/developer/nextflow.dag.md

@@ -0,0 +1,19 @@
+
+# `nextflow.dag`
+
+The `nextflow.dag` package implements the workflow DAG and renderers for several diagram formats.
+
+## Class Diagram
+
+```{mermaid} diagrams/nextflow.dag.mmd
+```
+
+```{note}
+Some classes may be excluded from the above diagram for brevity.
+```
+
+## Notes
+
+The workflow DAG defines the network of processes, channels, and operators that comprise a workflow. It is produced by the execution of the Nextflow script. See [nextflow.script](nextflow.script.md) for more details.
+
+Implementations of the `DagRenderer` interface define how to render the workflow DAG to a particular diagram format. See {ref}`workflow-diagram` for more details.