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

examples/references/context.md

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+---
+title: Reference Context
+namespaces:
+  std: ./standard
+---
+
+# Reference Context
+
+This document declares the namespaces used by reference examples.
+
+## Local Overview
+
+Local sections can be addressed with `#local-overview`.
+
+<!-- mkt:region id="summary-snippet" tags="reuse summary" -->
+This named region can be resolved with `#region:summary-snippet` or
+`#tag:summary`.
+<!-- /mkt:region -->
+
+```python {#example-loader tags="code demo" tangle="src/example_loader.py"}
+def load_example():
+    return "ready"
+```
+
+```mkt-include {#payment-example ref="std:clauses.md#payment-terms"}
+```

examples/references/standard/clauses.md

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+# Standard Clauses
+
+## Payment Terms {#payment-terms}
+
+Payment is due within 30 days unless a governing contract says otherwise.
+
+## Warranty
+
+The warranty period starts on the effective date.