这个 xquery 脚本中的语法错误是什么？

发布于 2024-09-06 03:33:56 字数 2180 浏览 2 评论 0原文

我是 XQuery 的初学者，尝试做一些简单的练习来学习它。但是我试图组合在一起的这个最新查询拒绝运行，给我一个语法错误。

这是我的 XQuery：

<HTML>
<HEAD><TITLE>Alphabetical Cities Lists</TITLE></HEAD>
<BODY>
{
  for $indcode in (65 to 70)
  let $indlet := codepoints-to-string($indcode)
  return 
     <H1> {$indlet} LIST </H1>
     {
       for $cit in doc("mydoc.xml")/CITIES/ENTITY
       where starts-with($cit/NAME,$indlet)
       order by $cit/NAME
       return <LI>{$cit/NAME}</LI>
     }
     </OL>
} 
</BODY>
</HTML>

这是我的 XML 文件 mydoc.xml 的子集：

<CITIES>
  <ENTITY>
    <NAME>Hastings</NAME>
    <CITYCOD>230</CITYCOD>
    <CNTYCOD>01</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Tilden</NAME>
    <CITYCOD>487</CITYCOD>
    <CNTYCOD>02</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Alliance</NAME>
    <CITYCOD>008</CITYCOD>
    <CNTYCOD>07</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Hemingford</NAME>
    <CITYCOD>236</CITYCOD>
    <CNTYCOD>07</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Ainsworth</NAME>
    <CITYCOD>003</CITYCOD>
    <CNTYCOD>09</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Kearney</NAME>
    <CITYCOD>269</CITYCOD>
    <CNTYCOD>10</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Oakland</NAME>
    <CITYCOD>358</CITYCOD>
    <CNTYCOD>11</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Eagle</NAME>
    <CITYCOD>159</CITYCOD>
    <CNTYCOD>13</CNTYCOD>
  </ENTITY>
</CITIES>

我想要它做的是打印出一个简单的 HTML 文档，其中包含这些城市名称的多个列表，按它们开头的字母进行划分（A 到F）。

但是当我尝试在此网站上运行它时，它给了我这个错误：

查询：<>，第 9 行，第 6 列：[XPST0003] 语法错误，意外的“'{'”，期待“'}'”

我不知道为什么这么说。我检查了又检查，但我的大括号似乎都正确匹配。谁能看出问题是什么吗？谢谢。

原文

I'm a beginner to XQuery, trying to do some simple exercises to learn it. But this latest query I'm trying to put together refuses to run, giving me a syntax error.

This is my XQuery:

<HTML>
<HEAD><TITLE>Alphabetical Cities Lists</TITLE></HEAD>
<BODY>
{
  for $indcode in (65 to 70)
  let $indlet := codepoints-to-string($indcode)
  return 
     <H1> {$indlet} LIST </H1>
     {
       for $cit in doc("mydoc.xml")/CITIES/ENTITY
       where starts-with($cit/NAME,$indlet)
       order by $cit/NAME
       return <LI>{$cit/NAME}</LI>
     }
     </OL>
} 
</BODY>
</HTML>

And this is a subset of my XML file mydoc.xml:

<CITIES>
  <ENTITY>
    <NAME>Hastings</NAME>
    <CITYCOD>230</CITYCOD>
    <CNTYCOD>01</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Tilden</NAME>
    <CITYCOD>487</CITYCOD>
    <CNTYCOD>02</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Alliance</NAME>
    <CITYCOD>008</CITYCOD>
    <CNTYCOD>07</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Hemingford</NAME>
    <CITYCOD>236</CITYCOD>
    <CNTYCOD>07</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Ainsworth</NAME>
    <CITYCOD>003</CITYCOD>
    <CNTYCOD>09</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Kearney</NAME>
    <CITYCOD>269</CITYCOD>
    <CNTYCOD>10</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Oakland</NAME>
    <CITYCOD>358</CITYCOD>
    <CNTYCOD>11</CNTYCOD>
  </ENTITY>
  <ENTITY>
    <NAME>Eagle</NAME>
    <CITYCOD>159</CITYCOD>
    <CNTYCOD>13</CNTYCOD>
  </ENTITY>
</CITIES>

What I want it to do is print out a simple HTML document with several lists of these city names, broken out by the letter they start with (A to F).

But when I try running this out on this site, it gives me this error:

Query: <>, line 9, column 6: [XPST0003] syntax error, unexpected "'{'", expecting "'}'"

I have no idea why it says that. I've checked and checked, but my curly braces all seem properly matched. Can anyone see what the problem is? Thanks.

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笙痞 2024-09-13 03:33:56

这是一个常见的错误。

您需要在

和
节点之间放置一个 , 。

单个节点是一个 XQuery 表达式（直接元素构造函数内的多个节点也是如此）。返回表达式必须是一个表达式。在这种情况下，您想要返回两个节点。每个节点都是一个单独的项目，因此为了返回它们，您需要按顺序连接两个节点。

查询如下所示：

<HTML>
<HEAD><TITLE>Alphabetical Cities Lists</TITLE></HEAD>
<BODY>
{
  for $indcode in (65 to 70)
  let $indlet := codepoints-to-string($indcode)
  return 
     (<H1> {$indlet} LIST </H1>,
     <OL>
     {
       for $cit in doc("mydoc.xml")/CITIES/ENTITY
       where starts-with($cit/NAME,$indlet)
       order by $cit/NAME
       return <LI>{$cit/NAME}</LI>
     }
     </OL>)
} 
</BODY>
</HTML>

This is a common mistake.

You need to place a , between the <H1> and <OL> nodes.

A single node is an XQuery expression (as are multiple nodes inside a direct element constructor). The return expression must be an expression. In this case you want to return two nodes. Each node is a single item and so in order to return them both you need to concatenate the two nodes in a sequence.

The query would look like this:

<HTML>
<HEAD><TITLE>Alphabetical Cities Lists</TITLE></HEAD>
<BODY>
{
  for $indcode in (65 to 70)
  let $indlet := codepoints-to-string($indcode)
  return 
     (<H1> {$indlet} LIST </H1>,
     <OL>
     {
       for $cit in doc("mydoc.xml")/CITIES/ENTITY
       where starts-with($cit/NAME,$indlet)
       order by $cit/NAME
       return <LI>{$cit/NAME}</LI>
     }
     </OL>)
} 
</BODY>
</HTML>

回复收藏 0 原文

山有枢 2024-09-13 03:33:56

您忘记了

;在第 9 行的 { 之前。

所以应该是：

<HTML>
<HEAD><TITLE>Alphabetical Cities Lists</TITLE></HEAD>
<BODY>
{
  for $indcode in (65 to 70)
  let $indlet := codepoints-to-string($indcode)
  return 
     <H1> {$indlet} LIST </H1>
     <OL>
     {
       for $cit in doc("mydoc.xml")/CITIES/ENTITY
       where starts-with($cit/NAME,$indlet)
       order by $cit/NAME
       return <LI>{$cit/NAME}</LI>
     }
     </OL>
} 
</BODY>
</HTML>

You forgot a <OL> before the { on line 9.

So it should be:

<HTML>
<HEAD><TITLE>Alphabetical Cities Lists</TITLE></HEAD>
<BODY>
{
  for $indcode in (65 to 70)
  let $indlet := codepoints-to-string($indcode)
  return 
     <H1> {$indlet} LIST </H1>
     <OL>
     {
       for $cit in doc("mydoc.xml")/CITIES/ENTITY
       where starts-with($cit/NAME,$indlet)
       order by $cit/NAME
       return <LI>{$cit/NAME}</LI>
     }
     </OL>
} 
</BODY>
</HTML>

回复收藏 0 原文

~没有更多了~