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2.1-2.2-changelog.md

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Removed ShapeExternal from shapeExpr so you can't have EXTERNAL inside an e.g. ShapeAnd

Removed IDs from shapeExprs and created a ShapeDecl: id:shapeExprLabel abstract:BOOL shapeExpr:shapeExpr | ShapeExternal

Validation Definition includes satisfiesDescendant.

Semantics starts with a calculation of nestedShapes.

Definition of Satisfies is followed by an example of inheritance.

Fixed typos in JSG for {Iri,Literal,Language}StemRange and associated ShExC grammar.

Clarified representation of BCP47 language range wildcard ("*").

5.5.2 Shape Expression Semantics leads with definition of getEffectiveTEs.

Definition of matchesShape introduces (and uses) slices returned from getEffectiveTEs() with this diff:

- * neigh(G, n) can be partitioned into two sets matched and remainder such that matches(matched, expression, m). If expression is absent, remainder = neigh(G, n).
+ * slices is the concatenation of getEffectiveTEs for each label in parentShapeLabels(s).
+ * nCard is the length of slices.
+ * neigh(G, n) can be partitioned into two sets matched and remainder and matched is partitioned into nCard partitions pi such that matches(pi, slicesi, m). If nCard is 0, remainder = neigh(G, n). 

@@REVISIT after Iovka reviews 5.5.2.1@@ 5.5.2.1 Definition of the maximal typing includes …

IMPORT EXAMPLE 2 - CIRCULAR IMPORT includes a duplicate IMPORT

Added shapeExprRef non-abstract shape requirement

Added 5.7.6 Acyclic Extension Requirement

Added 5.7.7 Extension Coherence

Updated shapeExprDecl grammar to include special case for "EXTERNAL".

Updated shapeRef grammar to include "EXACTLY".

Aligned PN_LOCAL grammar with SPARQL/Turtle.