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doc/manual/source/language/expression/path-reference.md

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+# Path Reference Expression
+
+A path reference expression accesses a field of an object.
+
+```dcdl
+config.host
+config.feature_hoge.enable
+```
+
+## Evaluation
+
+The expression on the left is evaluated as an object, then the named field is referenced.
+The referenced field is not evaluated until needed.
+
+Referencing a field that does not exist produces a diagnostic.
+An explicit `Unknown` range does not represent a missing field, so it does not make field presence ambiguous.