#222: New (better) definition of node expressions (#274)

Closes #222

* #222: New (better) definition of node expressions

* #222: Added link to CBD submission for now (is there a more modern reference for RDF 1.2 reification)?

* #222: Clarified that sh:resultPath can also be a node expression

* #222: Formatting of example (tabs)

* #222: Fixed typos (thanks, Alex)

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

* #222: Cleaner and more formal definition of node expression evaluation and syntax

* #222: Dropped informative meta comment/Informally

* #222: Further editing of sh:path syntax rules to clarify processing order

* Update shacl12-core/index.html

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

* Update shacl12-core/index.html

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

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

Author: HolgerKnublauch