docs: add readme

zazuko · Oct 13, 2023 · d123904 · d123904
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+# @vocabulary/sh
+
+This package contains a snapshot of the SHACL vocabulary with the addition of
+an unofficial rendition of the latest [SHACL Advanced Features](https://w3c.github.io/shacl/shacl-af/) 
+draft.
+
+## SHACL Advanced Features
+
+SHACL-AF adds a handful of properties and node expressions. The latter are expressed here as
+node shapes.
+
+### Known issues
+
+The node shape `sh:FunctionExpression` currently does not work and will cause false negatives when
+validation a shape which uses function expressions.