'ground' in SPARQL update

This is a comment on
http://www.w3.org/TR/2013/REC-sparql11-update-20130321/
specifically the use of the word 'ground' (in three of the five occurrences)


First:
http://www.w3.org/TR/2013/REC-sparql11-update-20130321/#insertData

"That is, the INSERT DATA statement only allows to insert ground triples."

The context clearly indicates that what is meant by the word ground is a triple without any variables, but the relevant definition of the word ground is this:
http://www.w3.org/TR/rdf-mt/#defgd
A ground RDF graph is one with no blank nodes.

My suggested correction would be to delete the quoted sentence.

Second:
The same problem exhibits in 3.1.3.2, where 

"The template can contain triples with no variables (known as ground or explicit triples),"
could be replaced by
"The template can contain triples with no variables (known as explicit triples),"

Third:
Following this terminology, then the ground in section 4.3.1 should be replaced by explicit, and that in 4.3.2 should be left unchanged.

i.e. my understanding of the intent is that inserts can include blank nodes (which are added as freshly minted nodes) and deletes cannot.


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I realize that no action is likely on this comment for a while, but still … one day it may be acted on!


Jeremy J Carroll
Principal Architect
Syapse, Inc.