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dxvargas's questions

Martin Hope
dxvargas
Asked: 2024-06-25 01:42:18 +0800 CST
  • 6

这是我尝试用“创建”日期填充空白的“发布于”日期的结果。

Virtuoso 37000 Error SP031: SPARQL compiler: Variable 'entity' is not allowed in a constant clause

SPARQL query:
define sql:big-data-const 0
#output-format:text/html
define sql:signal-void-variables 1

INSERT DATA {
  GRAPH <http://mysite.eu/collection/published> {
    ?entity <http://mysite.eu/collection/published-at> ?created
    WHERE {
      SELECT ?entity ?created WHERE {
        GRAPH <http://mysite.eu/collection/published> {
          {
            ?entity <http://purl.org/dc/terms/issued> ?created .
            OPTIONAL { ?s <http://mysite.eu/collection/published-at> ?published . }
            FILTER(!bound(?published))
          }
        }
      }
    }
  }
}

这里出了什么问题？ 提到的常量子句是什么意思？ 如何修复它？

编辑1：

我使用更简单的查询也会出现类似的错误，如下所示：

Virtuoso 37000 Error SP031: SPARQL compiler: Variable 'o' is not allowed in a constant clause

SPARQL query:
define sql:big-data-const 0
#output-format:text/html
define sql:signal-void-variables 1

DELETE DATA {
  GRAPH <http://mysite.eu/collection/published> {
    <http://data.europa.eu/w21/33598e9e-2654-4639-9528-d70772837ce4> <http://mysite.eu/collection/published-at> ?o
  }
}

编辑 2：DELETE 查询工作正常，如下所示：

DELETE WHERE {
  GRAPH <http://mysite.eu/collection/published> {
    <http://data.europa.eu/w21/33598e9e-2654-4639-9528-d70772837ce4> <http://mysite.eu/collection/published-at> ?o
  }
}
sparql