Cannot reference a mapping from within itself with blank node as subject

[Melchyore]

Issue type: 🐛 Bug

Description

I want to create an ordered list using rdf:first and rdf:rest from an array (the number of array elements is random). It works in Matey but doesn't work with the latest YARRRML parser.

Steps

{
  "policies": [
    {
      "id": 1877588419,
      "type": "http://www.w3.org/ns/odrl/2/Set",
      "creator": null,
      "description": null,
      "issued": "2023-06-26",
      "rules": {
        "permissions": [
          {
            "id": 2049408449,
            "policy_id": 1035993210,
            "operand": "xone",
            "first": 1658331773,
            "logical_constraints": {
              "and": [],
              "or": [],
              "andSequence": [],
              "xone": [
                {
                  "id": 1658331773,
                  "policy_id": 1035993210,
                  "left_operand": "http://www.w3.org/ns/odrl/2/absolutePosition",
                  "operator": "http://www.w3.org/ns/odrl/2/eq",
                  "valueType": "iri",
                  "right_operand_value_iri": "zefzfzef",
                  "right_operand_value_string": null,
                  "right_operand_value_duration": null,
                  "right_operand_value_date": null,
                  "right_operand_value_dateTime": null,
                  "right_operand_value_float": null,
                  "rule_id": 2049408449,
                  "next": 3045330922
                },
                {
                  "id": 3045330922,
                  "policy_id": 1035993210,
                  "left_operand": "http://www.w3.org/ns/odrl/2/absolutePosition",
                  "operator": "http://www.w3.org/ns/odrl/2/eq",
                  "valueType": "iri",
                  "right_operand_value_iri": "zefzfzef",
                  "right_operand_value_string": null,
                  "right_operand_value_duration": null,
                  "right_operand_value_date": null,
                  "right_operand_value_dateTime": null,
                  "right_operand_value_float": null,
                  "rule_id": 2049408449,
                  "next": null
                }
              ]
            }
          }
        ]
      }
    }
  ]
}

prefixes:
  odrl: http://www.w3.org/ns/odrl/2/
  xsd: http://www.w3.org/2001/XMLSchema#
  rdfs: http://www.w3.org/2000/01/rdf-schema#
  rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns#
  occe: https://w3id.org/occe/
  dpv: https://w3id.org/dpv#
  obo: http://purl.obolibrary.org/obo/
  dc-terms: http://purl.org/dc/terms/
  dc-elements: http://purl.org/dc/elements/
  this: https://example.com/
  idlab-fn: http://example.com/idlab/function/
  grel: http://users.ugent.be/~bjdmeest/function/grel.ttl#

sources:
  parent:
    access: data.json
    referenceFormulation: jsonpath
    iterator: "$"

  permission:
    access: data.json
    referenceFormulation: jsonpath
    iterator: "$.policies.[*].rules.permissions.[*]"

  permission_constraint_xone:
    access: data.json
    referenceFormulation: jsonpath
    iterator: "$.policies[*].rules.permissions.[*].logical_constraints.xone.[*]"

mappings:
  permission:
    sources:
      - permission
    s: this:policies/$(policy_id)/permissions/$(id)
    po:
        - p: odrl:constraint
          o:
              - value: this:policies/$(policy_id)/permissions/$(id)/constraints/xone
                type: iri
                condition:
                  function: equal
                  parameters:
                    - [grel:valueParameter, $(operand)] # From permission's constraint
                    - [grel:valueParameter2, "xone"] # From permission's constraint
    
  permission_constraint_xone_parent:
    sources:
      - permission
    s: this:policies/$(policy_id)/permissions/$(id)/constraints/xone
    condition:
      function: equal
      parameters:
        - [grel:valueParameter, $(operand)] # From permission's constraint
        - [grel:valueParameter2, "xone"] # From permission's constraint
    po:
      - p: odrl:xone
        o:
          - mapping: permission_constraints_xone
            condition:
              function: equal
              parameters:
                - [str1, $(first)] # From permission's constraint
                - [str2, $(id)] # From permission's constraint xone

  permission_constraints_xone:
    sources:
      - permission_constraint_xone
    s: null
    po:
      - [rdf:first, this:policies/$(policy_id)/permissions/$(rule_id)/logical_constraints/xone/$(id)~iri]
      - p: rdf:rest
        o:
          - mapping: permission_constraints_xone
            condition:
              function: equal
              parameters:
                - [str1, $(next)]
                - [str2, $(id)]

          - value: rdf:nil
            type: iri
            condition:
              function: idlab-fn:isNull
              parameters:
                - [idlab-fn:str, $(next)]

The above snippet show produces the following RDF (which is wrong: the blank nodes for the objects are wrong, for the first triple, it should be rdf:rest _:1):

_:0 rdf:first <https://example.com/policies/1035993210/permissions/2049408449/logical_constraints/xone/1658331773>. # There is no reference to the next triple, i.e: rdf:rest _:1

_:1 rdf:first <https://example.com/policies/1035993210/permissions/2049408449/logical_constraints/xone/3045330922>;
  rdf:rest rdf:nil .

But with Matey, it produces a correct RDF:

_:b34_0 rdf:first <https://example.com/policies/1035993210/permissions/2049408449/logical_constraints/xone/1658331773> ;
	rdf:rest _:b34_1 . # Here, this is a correct reference to the next triple.

_:b34_1 rdf:first <https://example.com/policies/1035993210/permissions/2049408449/logical_constraints/xone/3045330922> ;
	rdf:rest rdf:nil.

Please do note that removing the condition (in local) will output the same blank node as the subject, i.e: _:0 rdf:rest _:0 which is also wrong. But it works correcly in Matey.

Environment

Matey and latest yarrrml-parser 1.5.4