afs commented on issue #3883:
URL: https://github.com/apache/jena/issues/3883#issuecomment-4326786553
Jena support RDF 1.2
In RDF-star, `<<>>` was a kind of RDF term but was often used as an
occurrence, not as a triple term.
In RDF 1.2 `<< :s :p :o >>` is a Turtle syntax form equivalent form (c.f.
lists) for an occurrence and the triple term is `<<( ... )>>`
```turtle
:alice :claims << :bob :age 23 >> .
```
becomes the triples
```turtle
:alice :claims _:b .
_:b rdf:reifies <<( :bob :age 23 )>> .
```
That is where the blank node is coming from.
You use use a variable to find the blank node
```sparql
DELETE WHERE { :alice :claims << :bob :age 23 ~ ?R >> }
```
or give URIs to reifications in the data.
```turtle
:alice :claims << :bob :age 23 ~ :r >> .
:alice :claims :r .
:r rdf:reifies <<( :bob :age 23 )>> .
```
```sparql
DELETE DATA { :alice :claims << :bob :age 23 ~:r >> . }
```
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