英文:
How to get subject value from cts:triples output
问题
以下是您要求的翻译结果：
查询如下以获取来自“testCollection”的三元组列表，其中谓词为“testName”。
我可以在qconsole中看到以下结果。
我的要求是从结果中获取“主语/宾语”值。
例如，如果我想获取“主语”的值，那么输出应该如下：
a
b
c
d
e
而对于“宾语”，输出应该如下：
aa
bb
cc
dd
ee
任何帮助都会感激不尽。
英文:
I am executing below query to get the list of triples from "testCollection" where predicate is "testName".
cts:triples((), sem:iri("testName"), (), (), (), cts:and-query(cts:collection-query("testCollection"))).
I can see the result in qconsole as below.
<a> <testName> <aa> .
<b> <testName> <bb> .
<c> <testName> <cc> .
<d> <testName> <dd> .
<e> <testName> <ee> .
My requirement is to get the subject / object values from the result.
for example, let's say if I want to get the values of subject, then output should be as below,
a
b
c
d
e
and for object output should be as below,
aa
bb
cc
dd
ee
Any help is appreciated.
答案1
得分: 2
以下是您要求的翻译部分：
对于您的示例，使用cts函数，我将使用与之相关的项目：sem:triple-subject()和sem:triple-object()
请记住，IRI和字符串不同。您的数据具有IRI，而您期望的结果是字符串。我提供一个匹配您所需的示例：
xquery version "1.0-ml";
(: Sample Output based on docs - sem triples
Also, your data suggests that all items are IRIs :)
let $triples := (
sem:triple(sem:iri("a"), sem:iri("testName"), sem:iri("aa")),
sem:triple(sem:iri("b"), sem:iri("testName"), sem:iri("bb")),
sem:triple(sem:iri("c"), sem:iri("testName"), sem:iri("cc"))
)
return for $triple in $triples
return fn:string-join((xs:string(sem:triple-subject($triple)), xs:string(sem:triple-object($triple))), ",")
在这种情况下，我将其强制转换为xs:string()以匹配您期望的输出，并通过逗号连接主题和对象以进行显示。
a,aa
b,bb
c,cc
但是关于完整的IRI：
sem:triple(sem:iri("c"), sem:iri("testName"), sem:iri("http://www.example.com#cc"))
其结果将是：
c, http://www.example.com#cc
我不会进一步讨论这个问题 - 只是想指出，您应该了解IRI背后实际的内容，因为您的示例是简化的。
最后，如果我不是在cts空间中工作，我可能会编写更具体的SPARQL查询，以仅返回主题和对象，并使用xdmp:sparql()或op:from-sparql()。
英文:
For Your example, using cts functions, I would use the items related to that: sem:triple-subject() and sem:triple-object()
Please keep in mind that IRIs and Strings are not the same.. Your data has IRIs and your expected result is string. I present a sample that matches what You state that You want:
xquery version "1.0-ml";
(:
Sample Output based on docs - sem triples
Also, your data suggests that all items are IRIs
:)
let $triples := (
sem:triple(sem:iri("a"), sem:iri("testName"), sem:iri("aa")),
sem:triple(sem:iri("b"), sem:iri("testName"), sem:iri("bb")),
sem:triple(sem:iri("c"), sem:iri("testName"), sem:iri("cc"))
)
return for $triple in $triples
return fn:string-join((xs:string(sem:triple-subject($triple)), xs:string(sem:triple-object($triple))), ",")
In this case, I cast as xs:string() to match your expected output and joined the subject and object by a comma for display purposes.
a,aa
b,bb
c,cc
But what about full IRIs:
sem:triple(sem:iri("c"), sem:iri("testName"), sem:iri("http://www.example.com#cc"))
The result of that result would be:
c, http://www.example.com#cc
I'll not take that further - just wanted to point out that you should be aware of what is actually behind an IRI since your sample was simplified.
Lastly, I would probably write a more specific SPARQL query to return just the subject and object and use xdmp:sparql() or op:from-sparql() if I were not in the cts space for my work already.
答案2
得分: 2
你可以使用sem:triple-object()和sem:triple-subject()函数分别返回对象或主题。
for $triple in cts:triples((), sem:iri("testName"), (), (), (), cts:collection-query("testCollection"))
return sem:triple-object($triple)
英文:
You can use the sem:triple-object() and sem:triple-subject() functions to return just the object or the subject.
for $triple in cts:triples((), sem:iri("testName"), (), (), (), cts:collection-query("testCollection"))
return sem:triple-object($triple)
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