extension for ref resolve, explode, implode, weave, tangle

examples/literate/app.md

@@ -0,0 +1,15 @@
+# Literate App Example
+
+This example explains the helper before showing the application entry point.
+
+```python {#helpers}
+def helper():
+    return "ready"
+```
+
+```python {#main tangle="src/app.py"}
+<<helpers>>
+
+def main():
+    return helper()
+```