jena - 使用 Jena 规则更新本体三元组中的值

Question

我有个问题。我有这样的耶拿规则：

[rule1:

(?if rdf:type p:InferredConfiguration)
(?if p:userName ?userEmail)
(?subProfile rdf:type u:PersonSubProfile)
(?subProfile u:hasUsername ?email)
equal(?userEmail, ?email)

(?subProfile u:hasName "")
(?subProfile u:hasLastname "")
(?subProfile u:hasPhone "")
(?subProfile u:hasEducation "Low")
->
(?subProfile u:hasPhone "00000")

print('**************** Phone defined - Rule 1 ***************')
]

问题是上面的规则并没有更新“hasPhone”属性的值，而是增加了一个值。如何更新值或删除旧值并添加新值？

谢谢你。

Answer 1

我找到了解决方案

[rule1:

(?if rdf:type p:InferredConfiguration)
(?if p:userName ?userEmail)
(?subProfile rdf:type u:PersonSubProfile)
(?subProfile u:hasUsername ?email)
equal(?userEmail, ?email)

(?subProfile u:hasName "")
(?subProfile u:hasLastname "")
(?subProfile u:hasPhone ?var)
equal (?var, "")
(?subProfile u:hasEducation "Low")
  ->
drop(7)
(?subProfile u:hasPhone "00000")

print('**************** Phone defined - Rule 1 ***************')
]