[data-shapes] new commits pushed by HolgerKnublauch

The following commits were just pushed by HolgerKnublauch to https://github.com/w3c/data-shapes:

* #314: Made focusNode an explicit param of exprEval, SPARQL-based expressions now pre-bind all scope vars (#370)

Closes #314

* #314: Made focusNode an explicit param of exprEval, SPARQL-based expressions now pre-bind all scope vars

* #314: Fixes

* #314: Clarified role of active graph

* #314: active graph -> focus graph

* Apply suggestions from code review

Co-authored-by: Ted Thibodeau Jr <tthibodeau@openlinksw.com>

* Updated sh:expression to [ true ] list instead of "or" semantics

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Co-authored-by: Ted Thibodeau Jr <tthibodeau@openlinksw.com>
  by Holger Knublauch
https://github.com/w3c/data-shapes/commit/e67bae66750bdc481c509ce5878e1afaff93f82e



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