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问RML和FnO不能一起运行。
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Stack Overflow用户

提问于 2021-02-28 23:41:45

回答 1查看 289关注 0票数 2

我试图在RML中使用FnO函数(我喜欢像here这样的string_split )。我的文件夹是这样的：

我正在执行java -jar "rmlmapper.jar" -m mapping-cuisines.ttl -o output-cuisines.ttl -s turtle

但是，当我尝试实现<#FunctionMap>时，会收到以下错误消息：

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0
        at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
        at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
        at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
        at java.base/java.util.Objects.checkIndex(Objects.java:372)
        at java.base/java.util.ArrayList.get(ArrayList.java:458)
        at be.ugent.rml.functions.DynamicMultipleRecordsFunctionExecutor.execute(DynamicMultipleRecordsFunctionExecutor.java:66)
        at be.ugent.rml.functions.AbstractSingleRecordFunctionExecutor.execute(AbstractSingleRecordFunctionExecutor.java:17)
        at be.ugent.rml.termgenerator.LiteralGenerator.generate(LiteralGenerator.java:42)
        at be.ugent.rml.Executor.generatePredicateObjectGraphs(Executor.java:157)
        at be.ugent.rml.Executor.executeWithFunction(Executor.java:115)
        at be.ugent.rml.Executor.execute(Executor.java:76)
        at be.ugent.rml.cli.Main.main(Main.java:206)

对我来说没有任何意义。根据git，函数是从我执行rmlmapper的位置动态加载的。

数据集：https://mega.nz/file/LsJAQRaR#84lfASPXVA08zm0RbuRfNvR7tx-vklS82D1KBGhhdA8

我的守则：

@base <http://example.org/data> .
@prefix ex: <http://example.org/ns#> .
@prefix rr: <http://www.w3.org/ns/r2rml#> .
@prefix rml: <http://semweb.mmlab.be/ns/rml#> .
@prefix ql: <http://semweb.mmlab.be/ns/ql#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix csvw: <http://www.w3.org/ns/csvw#> .
@prefix fnml: <http://semweb.mmlab.be/ns/fnml#> .
@prefix fno: <https://w3id.org/function/ontology#> .
@prefix grel: <http://users.ugent.be/~bjdmeest/function/grel.ttl#> .


<#LogicalSource>
    a rml:LogicalSource;
    rml:source "dataworld-restaurants-cuisines.csv";
    rml:referenceFormulation ql:CSV.


<#MyTriplesMap>
    a rr:TriplesMap;
    rml:logicalSource <#LogicalSource>;

    rr:subjectMap [
        rr:template "http://example.org/{id}";
    ];

    rr:predicateObjectMap [
        rr:predicate ex:aProperty;
        rr:objectMap <#FunctionMap>;
    ].

<#FunctionMap>
    fnml:functionValue [
        rml:logicalSource <#LogicalSource> ;
        rr:predicateObjectMap [
            rr:predicate fno:executes ;
            rr:objectMap [ rr:constant grel:toUpperCase ]
        ] ;
        rr:predicateObjectMap [
            rr:predicate grel:valueParameter ;                  
            rr:objectMap [
                rml:reference "spicy"                           
            ]
        ]
    ] .

我的functions.ttl：

@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix doap:    <http://usefulinc.com/ns/doap#> .
@prefix fno:     <https://w3id.org/function/ontology#> .
@prefix fnoi:    <https://w3id.org/function/vocabulary/implementation#> .
@prefix fnom:    <https://w3id.org/function/vocabulary/mapping#> .
@prefix grel:    <http://users.ugent.be/~bjdmeest/function/grel.ttl#> .
@prefix grelm:   <http://fno.io/grel/rmlmapping#> .
@prefix rdfs:    <http://www.w3.org/2000/01/rdf-schema#> .

grel:toUpperCase a fno:Function ;
  fno:name "to Uppercase" ;
  rdfs:label "to Uppercase" ;
  dcterms:description "Returns the input with all letters in upper case." ;
  fno:expects ( grel:valueParam ) ;
  fno:returns ( grel:stringOut ) .

grelm:javaString
    a                  fnoi:JavaClass ;
    doap:download-page "GrelFunctions.jar" ;
    fnoi:class-name    "io.fno.grel.StringFunctions" .

grelm:uppercaseMapping
    a                    fnoi:Mapping ;
    fno:function         grel:toUpperCase ;
    fno:implementation   grelm:javaString ;
    fno:methodMapping    [ a                fnom:StringMethodMapping ;
                           fnom:method-name "toUppercase" ] .

csv

sparql

rdf

linked-data

rml-rdf

回答 1

Stack Overflow用户

回答已采纳

发布于 2021-03-17 15:39:28

我试过你的映射文件，它工作正常。当前映射文件将spicy中的数据转换为大写，并生成指定的RDF三元组。由于函数grel:toUpperCase默认包含在RMLMapper中，所以不需要functions.ttl来指定这些函数。只有当您想要添加您自己的自定义函数时，才需要这样做。关于RMLMapper中所有包含的函数的概述可以在这里找到：https://rml.io/docs/rmlmapper/default-functions/

给定实例

https://github.com/RMLio/rmlmapper-java/releases

从java -jar <path to jar> -m mapping.rml.ttl

I存储库下载最新的RMLMapper： it as： get输出，如下所示

mapping.rml.ttl

@base <http://example.org/data> .
@prefix ex: <http://example.org/ns#> .
@prefix rr: <http://www.w3.org/ns/r2rml#> .
@prefix rml: <http://semweb.mmlab.be/ns/rml#> .
@prefix ql: <http://semweb.mmlab.be/ns/ql#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix csvw: <http://www.w3.org/ns/csvw#> .
@prefix fnml: <http://semweb.mmlab.be/ns/fnml#> .
@prefix fno: <https://w3id.org/function/ontology#> .
@prefix grel: <http://users.ugent.be/~bjdmeest/function/grel.ttl#> .


<#LogicalSource>
    a rml:LogicalSource;
    rml:source "dataworld-restaurants-cuisines.csv";
    rml:referenceFormulation ql:CSV.


<#MyTriplesMap>
    a rr:TriplesMap;
    rml:logicalSource <#LogicalSource>;

    rr:subjectMap [
        rr:template "http://example.org/{id}";
    ];

    rr:predicateObjectMap [
        rr:predicate ex:aProperty;
        rr:objectMap <#FunctionMap>;
    ].

<#FunctionMap>
    fnml:functionValue [
        rml:logicalSource <#LogicalSource> ;
        rr:predicateObjectMap [
            rr:predicate fno:executes ;
            rr:objectMap [ rr:constant grel:toUpperCase ]
        ] ;
        rr:predicateObjectMap [
            rr:predicate grel:valueParameter ;                  
            rr:objectMap [
                rml:reference "spicy"                           
            ]
        ]
    ] .

输出(截断)

<http://example.org/afghani> <http://example.org/ns#aProperty> "NO".
<http://example.org/african> <http://example.org/ns#aProperty> "YES".
<http://example.org/african_portuguese> <http://example.org/ns#aProperty> "YES".
<http://example.org/american> <http://example.org/ns#aProperty> "NO".
<http://example.org/andhra> <http://example.org/ns#aProperty> "YES".
<http://example.org/arabian> <http://example.org/ns#aProperty> "NO".
<http://example.org/arabian_lebanese> <http://example.org/ns#aProperty> "NO".
<http://example.org/arabian_mexican> <http://example.org/ns#aProperty> "NO".
<http://example.org/arabian_middle_eastern> <http://example.org/ns#aProperty> "YES".
<http://example.org/asian> <http://example.org/ns#aProperty> "YES".
<http://example.org/assamese> <http://example.org/ns#aProperty> "NO".
<http://example.org/australian> <http://example.org/ns#aProperty> "YES".
<http://example.org/awadhi> <http://example.org/ns#aProperty> "YES".
<http://example.org/awadhi_mughlai> <http://example.org/ns#aProperty> "NO".
<http://example.org/bakery> <http://example.org/ns#aProperty> "NO".

FnO string_split

如果您想在RML中使用FnO的string_split，可以这样实现：

fno:executes：grel:string_split使用GREL拆分function.
grel:valueParameter：输入字符串。我在这里引用了CSV列cuisines.
grel:p_string_sep：，该字符串分隔符是GREL拆分函数必须拆分输入字符串的字符串分隔符。我用,来区分每一家餐厅的不同菜系。

mapping.rml.ttl

@base <http://example.org> .
@prefix rml: <http://semweb.mmlab.be/ns/rml#> .
@prefix rr: <http://www.w3.org/ns/r2rml#> .
@prefix ql: <http://semweb.mmlab.be/ns/ql#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix fnml: <http://semweb.mmlab.be/ns/fnml#> .
@prefix fno: <https://w3id.org/function/ontology#> .
@prefix grel: <http://users.ugent.be/~bjdmeest/function/grel.ttl#> .
@prefix ex: <http://example.org/ns#> .

<#LogicalSource>
    a rml:LogicalSource;
    rml:source "dataworld-restaurants-cuisines.csv";
    rml:referenceFormulation ql:CSV.


<#MyTriplesMap>
    a rr:TriplesMap;
    rml:logicalSource <#LogicalSource>;

    rr:subjectMap [
        rr:template "http://example.org/{id}";
    ];

    rr:predicateObjectMap [
        rr:predicate ex:cuisine;
        rr:objectMap <#FunctionMap>;
    ];
.

<#FunctionMap>
    fnml:functionValue [
        rml:logicalSource <#LogicalSource>;
        rr:predicateObjectMap [
            rr:predicate fno:executes; 
            rr:objectMap [ 
                rr:constant grel:string_split 
            ];
        ];
        rr:predicateObjectMap [
            rr:predicate grel:valueParameter;
            rr:objectMap [ 
                rml:reference "cuisines" 
            ];
        ];
        rr:predicateObjectMap [
            rr:predicate grel:p_string_sep;
            rr:objectMap [ 
                rr:constant ", ";
            ];
        ];
    ].

输出(截断)

<http://example.org/afghani> <http://example.org/ns#cuisine> "Afghani".
<http://example.org/african> <http://example.org/ns#cuisine> "African".
<http://example.org/african_portuguese> <http://example.org/ns#cuisine> "African".
<http://example.org/african_portuguese> <http://example.org/ns#cuisine> "Portuguese".
<http://example.org/american> <http://example.org/ns#cuisine> "american".
<http://example.org/andhra> <http://example.org/ns#cuisine> "Andhra".
<http://example.org/arabian> <http://example.org/ns#cuisine> "Arabian".
<http://example.org/arabian_lebanese> <http://example.org/ns#cuisine> "Arabian".
<http://example.org/arabian_lebanese> <http://example.org/ns#cuisine> "Lebanese".
<http://example.org/arabian_mexican> <http://example.org/ns#cuisine> "Arabian".
<http://example.org/arabian_mexican> <http://example.org/ns#cuisine> "Mexican".
<http://example.org/arabian_middle_eastern> <http://example.org/ns#cuisine> "Arabian".
<http://example.org/arabian_middle_eastern> <http://example.org/ns#cuisine> "Middle Eastern".
<http://example.org/asian> <http://example.org/ns#cuisine> "Asian".
<http://example.org/assamese> <http://example.org/ns#cuisine> "Assamese".
<http://example.org/australian> <http://example.org/ns#cuisine> "Australian".
<http://example.org/awadhi> <http://example.org/ns#cuisine> "Awadhi".
<http://example.org/awadhi_mughlai> <http://example.org/ns#cuisine> "Awadhi".
<http://example.org/awadhi_mughlai> <http://example.org/ns#cuisine> "Mughlai".
<http://example.org/bakery> <http://example.org/ns#cuisine> "bakery".
<http://example.org/bar_food> <http://example.org/ns#cuisine> "Bar Food".
<http://example.org/bar_food_brazilian> <http://example.org/ns#cuisine> "Bar Food".
<http://example.org/bar_food_brazilian> <http://example.org/ns#cuisine> "Brazilian".

注意事项：我研究RML和FnO技术

票数 3

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/66414992

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