Hi,

I get this error on `DELETE DATA` via <http://localhost:8890/sparql>, but only when the triple's object is a `string`:

    Virtuoso 42000 Error SR186:SECURITY: No permission to execute dpipe DB.DBA.L_O_LOOK_NE with user ID 107, group ID 107

If the triple's object is a `URI`, the triple is deleted without error.

### Steps to reproduce:

Using the official Docker image:

    $ docker run --name virtuoso-7.2.10-official --interactive --tty \
        --env DBA_PASSWORD=dba --publish 1111:1111 --publish 8890:8890 \
        --volume `pwd`:/database openlink/virtuoso-opensource-7:7.2.10

Granted `SPARQL_UPDATE` and `WebDAV` to user `SPARQL` through Conductor.

    System Admin > User Accounts > User > SPARQL > Edit
      User type: SQL/ODBC and WebDAV
      Account Roles: SPARQL_SELECT, SPARQL_UPDATE

Workaround to prevent https://github.com/openlink/virtuoso-opensource/issues/1094:

    DB.DBA.RDF_DEFAULT_USER_PERMS_SET ('nobody', 7);

Insert data:

    INSERT DATA {
      GRAPH <http://mu.semte.ch/application> {
        <http://mu.semte.ch/application/name-as-uri> <http://schema.org/name> <http://mu.semte.ch/application/myname> .
        <http://mu.semte.ch/application/name-as-string> <http://schema.org/name> "My name" .
    } }

Deleting the triple with the `string` from <http://localhost:8890/sparql> fails:

    DELETE DATA {
      GRAPH <http://mu.semte.ch/application> {
        <http://mu.semte.ch/application/name-as-string> <http://schema.org/name> "My name" .
    } }

Error:

    Virtuoso 42000 Error SR186:SECURITY: No permission to execute dpipe DB.DBA.L_O_LOOK_NE with user ID 107, group ID 107
    
    SPARQL query:
    define sql:big-data-const 0
    #output-format:text/html
    define sql:signal-void-variables 1
    DELETE DATA {
      GRAPH <http://mu.semte.ch/application> {
        <http://mu.semte.ch/application/name-as-string> <http://schema.org/name> "My name" .
    } }

Deleting the triple with the `URI` as object from <http://localhost:8890/sparql> succeeds:

    DELETE DATA {
      GRAPH <http://mu.semte.ch/application> {
        <http://mu.semte.ch/application/name-as-uri> <http://schema.org/name> <http://mu.semte.ch/application/myname> .
    } }

Result:

    Delete from <http://mu.semte.ch/application>, 1 (or less) triples -- done

Deleting the triple with the `string` from `isql` succceeds:

    SQL> SPARQL DELETE DATA { GRAPH <http://mu.semte.ch/application> { <http://mu.semte.ch/application/name-as-string> <http://schema.org/name> "My name" . } } ;
    
    Done. -- 2 msec.
    SQL> SPARQL SELECT * WHERE { GRAPH <http://mu.semte.ch/application> { ?s <http://schema.org/name> ?o } } ;
    s                                                                                 o
    LONG VARCHAR                                                                      LONG VARCHAR
    _______________________________________________________________________________
    
    
    0 Rows. -- 1 msec.

Version:

    $ docker run openlink/virtuoso-opensource-7:7.2.10 version
    
    [openlink/virtuoso-opensource-7:7.2.10-r16-gcf64774-ubuntu]
    
    This Docker image is using the following version of Virtuoso:
    
    Virtuoso Open Source Edition (Column Store) (multi threaded)
    Version 7.2.10.3237-pthreads as of Jun  7 2023 (f3d88f16b)
    Compiled for Linux (x86_64-ubuntu_bionic-linux-gnu)
    Copyright (C) 1998-2023 OpenLink Software

Actually I encountered the error in Virtuoso 7.2.9 also, but that was in downstream Docker image [redpencil/virtuoso:1.1.0](https://hub.docker.com/layers/redpencil/virtuoso/1.1.0/images/sha256-4710c0e3d6877b15e4eedbbbfee875397aacd52691d15806d7e527f1d45cc7ab?context=explore). Did not test the official Docker image for 7.2.9 yet.

Just let me know if I need to test anything. Thank you for your help.
User SPARQL cannot delete triple with a string as object (SR186 DB.DBA.L_O_LOOK_NE) 
This is a GitHub Issue
repo:virtuoso-opensource
owner:openlink
Title : User SPARQL cannot delete triple with a string as object (SR186 DB.DBA.L_O_LOOK_NE) 
Issue date:

--- start body ---
Hi,

I get this error on `DELETE DATA` via <http://localhost:8890/sparql>, but only when the triple's object is a `string`:

    Virtuoso 42000 Error SR186:SECURITY: No permission to execute dpipe DB.DBA.L_O_LOOK_NE with user ID 107, group ID 107

If the triple's object is a `URI`, the triple is deleted without error.

### Steps to reproduce:

Using the official Docker image:

    $ docker run --name virtuoso-7.2.10-official --interactive --tty \
        --env DBA_PASSWORD=dba --publish 1111:1111 --publish 8890:8890 \
        --volume `pwd`:/database openlink/virtuoso-opensource-7:7.2.10

Granted `SPARQL_UPDATE` and `WebDAV` to user `SPARQL` through Conductor.

    System Admin > User Accounts > User > SPARQL > Edit
      User type: SQL/ODBC and WebDAV
      Account Roles: SPARQL_SELECT, SPARQL_UPDATE

Workaround to prevent https://github.com/openlink/virtuoso-opensource/issues/1094:

    DB.DBA.RDF_DEFAULT_USER_PERMS_SET ('nobody', 7);

Insert data:

    INSERT DATA {
      GRAPH <http://mu.semte.ch/application> {
        <http://mu.semte.ch/application/name-as-uri> <http://schema.org/name> <http://mu.semte.ch/application/myname> .
        <http://mu.semte.ch/application/name-as-string> <http://schema.org/name> "My name" .
    } }

Deleting the triple with the `string` from <http://localhost:8890/sparql> fails:

    DELETE DATA {
      GRAPH <http://mu.semte.ch/application> {
        <http://mu.semte.ch/application/name-as-string> <http://schema.org/name> "My name" .
    } }

Error:

    Virtuoso 42000 Error SR186:SECURITY: No permission to execute dpipe DB.DBA.L_O_LOOK_NE with user ID 107, group ID 107
    
    SPARQL query:
    define sql:big-data-const 0
    #output-format:text/html
    define sql:signal-void-variables 1
    DELETE DATA {
      GRAPH <http://mu.semte.ch/application> {
        <http://mu.semte.ch/application/name-as-string> <http://schema.org/name> "My name" .
    } }

Deleting the triple with the `URI` as object from <http://localhost:8890/sparql> succeeds:

    DELETE DATA {
      GRAPH <http://mu.semte.ch/application> {
        <http://mu.semte.ch/application/name-as-uri> <http://schema.org/name> <http://mu.semte.ch/application/myname> .
    } }

Result:

    Delete from <http://mu.semte.ch/application>, 1 (or less) triples -- done

Deleting the triple with the `string` from `isql` succceeds:

    SQL> SPARQL DELETE DATA { GRAPH <http://mu.semte.ch/application> { <http://mu.semte.ch/application/name-as-string> <http://schema.org/name> "My name" . } } ;
    
    Done. -- 2 msec.
    SQL> SPARQL SELECT * WHERE { GRAPH <http://mu.semte.ch/application> { ?s <http://schema.org/name> ?o } } ;
    s                                                                                 o
    LONG VARCHAR                                                                      LONG VARCHAR
    _______________________________________________________________________________
    
    
    0 Rows. -- 1 msec.

Version:

    $ docker run openlink/virtuoso-opensource-7:7.2.10 version
    
    [openlink/virtuoso-opensource-7:7.2.10-r16-gcf64774-ubuntu]
    
    This Docker image is using the following version of Virtuoso:
    
    Virtuoso Open Source Edition (Column Store) (multi threaded)
    Version 7.2.10.3237-pthreads as of Jun  7 2023 (f3d88f16b)
    Compiled for Linux (x86_64-ubuntu_bionic-linux-gnu)
    Copyright (C) 1998-2023 OpenLink Software

Actually I encountered the error in Virtuoso 7.2.9 also, but that was in downstream Docker image [redpencil/virtuoso:1.1.0](https://hub.docker.com/layers/redpencil/virtuoso/1.1.0/images/sha256-4710c0e3d6877b15e4eedbbbfee875397aacd52691d15806d7e527f1d45cc7ab?context=explore). Did not test the official Docker image for 7.2.9 yet.

Just let me know if I need to test anything. Thank you for your help.
--- end body ---
