同一路径的多个模板(MarkLogic)

Question

继承自这个thread，其中提到了模板驱动提取(TDE)，作为从特定元素检索值的一种方式。

目前，我正在尝试为某个路径一次创建多个TDE模板。我用来实现这一点的代码写在下面

xquery version "1.0-ml"; 
import module namespace tde = "http://marklogic.com/xdmp/tde" 
  at "/MarkLogic/tde.xqy";

let $t1 :=
<template xmlns="http://marklogic.com/xdmp/tde">
  <context>/question</context>
    <vars>
      <var>
        <name>EX</name>
        <val>""</val>
      </var>
    </vars>
  <triples>
    <triple>
      <subject>
        <val>sem:iri( $EX || name)</val>
      </subject>
      <predicate>
        <val>sem:iri("/has_tags")</val>
      </predicate>
      <object>
        <val>xs:dateTime( $EX || tags)</val>
      </object>
    </triple>
  </triples>
  </template>

let $t2 :=
<template xmlns="http://marklogic.com/xdmp/tde">
  <context>/question</context>
    <vars>
      <var>
        <name>EX</name>
        <val>""</val>
      </var>
    </vars>
  <triples>
    <triple>
      <subject>
        <val>sem:iri( $EX || name)</val>
      </subject>
      <predicate>
        <val>sem:iri("/date_posted")</val>
      </predicate>
      <object>
        <val>xs:dateTime( $EX || date_posted)</val>
      </object>
    </triple>
  </triples>
  </template>

return(
tde:template-insert("question_has_tags.xml",$t1, (), "http://marklogic.com/xdmp/tde"),
tde:template-insert("question_date_posted.xml",$t2, (), "http://marklogic.com/xdmp/tde")
)

示例文档

<?xml  version="1.0" encoding="UTF-8"?>
<question>
<tags>uifontweighttrait,spark-thriftserver,alarmmanager,recursive-type,string-iteration,security-trimming,google-earth</tags>
<date_posted>1978-06-23T22:22:43</date_posted>
<name>/question_on_forum</name>
</question>

使用以下命令测试该模板

tde:node-data-extract(fn:doc("/question"));

这导致了错误

[1.0-ml] TDE-EVALFAILED: tde:node-data-extract(fn:doc("/question/780989102826685")) -- Eval for Object='xs:dateTime( $EX || tags)' returns TDE-BADVALEXPRESSION: Invalid val expression: XDMP-CAST: (err:FORG0001) Invalid cast: "spotify,databags,laravel-horizon" cast as xs:dateTime

当我删除其中一个模板时，这个错误就解决了

=UPDATE=

以下代码用于尝试为每个模板创建多个三元组。但是，它也会导致相同的错误

xquery version "1.0-ml"; 
import module namespace tde = "http://marklogic.com/xdmp/tde" 
  at "/MarkLogic/tde.xqy";

let $t2 :=
<template xmlns="http://marklogic.com/xdmp/tde">
  <context>/question</context>
  <triples>
    <triple>
      <subject>
        <val>sem:iri( uri)</val>
      </subject>
      <predicate>
        <val>sem:iri("/date_posted")</val>
      </predicate>
      <object>
        <val>xs:dateTime(date_posted)</val>
      </object>
    </triple>
  </triples>
  <triples>
    <triple>
      <subject>
        <val>sem:iri(uri)</val>
      </subject>
      <predicate>
        <val>sem:iri("/has_tags")</val>
      </predicate>
      <object>
        <val>tags</val>
      </object>
    </triple>
  </triples>
  </template>
return(
tde:template-insert("question_date_posted.xml",$t2, (), "http://marklogic.com/xdmp/tde")
)

用于测试的节点提取(这是将发生错误的地方)

xquery version "1.0-ml";

tde:node-data-extract(fn:doc("/question"));

使用的示例文档

<?xml  version="1.0" encoding="UTF-8"?>
<question>
<tags>jsondate,jmsserializerbundle,omnikey,eula,template-deduction,pyclipper,asyncpg,naming,kubeconfig,timer-trigger</tags>
<date_posted>1986-02-21T22:27:50</date_posted>
<uri>/question</uri>
</question>

Answer 1

好了，我已经找到问题所在了。这是我的一个小错误。错误由一条注释指出。

let $t2 :=
<template xmlns="http://marklogic.com/xdmp/tde">
  <context>/question</context>
  <triples>
    <triple>
      <subject>
        <val>sem:iri( uri)</val>
      </subject>
      <predicate>
        <val>sem:iri("/date_posted")</val>
      </predicate>
      <object>
        <val>xs:dateTime(date_posted)</val>
      </object>
    </triple>
  </triples>
  <triples>
    <triple>
      <subject>
        <val>sem:iri(uri)</val>
      </subject>
      <predicate>
        <val>sem:iri("/has_tags")</val>
      </predicate>
      <object>
        <val>xs:string(tags)</val>     #needed to determine the variable type of tags object
      </object>
    </triple>
  </triples>
  </template>