XSLT 1.0："选择"表达式未计算为节点集

Question

应用 XSLT 1.0 样式表时，收到以下错误：

#<RuntimeError: runtime error: element apply-templates
The 'select' expression did not evaluate to a node set.

不完全确定在哪里/为什么会发生这种情况。以下是我使用 XSLT 1.0 的样式表：

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" encoding="utf-8" omit-xml-declaration="yes" />
  <xsl:template match="/message">
  {
    "heading": "<xsl:apply-templates select="normalize-space(heading/text())"/>",
    "note_id": <xsl:apply-templates select="number(NoteID)"/>,
    "player_id": <xsl:apply-templates select="number(PlayerID)"/>,
    "team_id": <xsl:apply-templates select="number(TeamID)"/>,
    "first_name": "<xsl:apply-templates select="normalize-space(Firstname/text())"/>",
    "last_name": "<xsl:apply-templates select="normalize-space(Lastname/text())"/>",
    "position": "<xsl:apply-templates select="normalize-space(Position/text())"/>",
    "hot_cold": "<xsl:apply-templates select="normalize-space(HotCold/text())"/>",
    "status": "<xsl:apply-templates select="normalize-space(Status/text())"/>",
    "description": "<xsl:apply-templates select="Description/*"/>",
    "insight": "<xsl:apply-templates select="Insight/*"/>",
    "timestamp": "<xsl:apply-templates select="time_stamp/*"/>"
  }
  </xsl:template>
  <xsl:template match="*">
      <xsl:copy>
          <xsl:apply-templates/>
      </xsl:copy>
  </xsl:template>
  <xsl:template match="text()">
  <xsl:variable name="escaped-text">
      <xsl:call-template name="replace-string">
          <xsl:with-param name="text" select="."/>
          <xsl:with-param name="replace" select="'&quot;'" />
          <xsl:with-param name="with" select="'&quot;'"/>
      </xsl:call-template>
  </xsl:variable>
  <xsl:value-of select="normalize-space($escaped-text)"/>
  </xsl:template>
  <xsl:template name="replace-string">
      <xsl:param name="text"/>
      <xsl:param name="replace"/>
      <xsl:param name="with"/>
      <xsl:choose>
          <xsl:when test="contains($text,$replace)">
              <xsl:value-of select="substring-before($text,$replace)"/>
              <xsl:value-of select="$with"/>
              <xsl:call-template name="replace-string">
                  <xsl:with-param name="text"
                      select="substring-after($text,$replace)"/>
                  <xsl:with-param name="replace" select="$replace"/>
                  <xsl:with-param name="with" select="$with"/>
              </xsl:call-template>
          </xsl:when>
          <xsl:otherwise>
              <xsl:value-of select="$text"/>
          </xsl:otherwise>
      </xsl:choose>
  </xsl:template>
</xsl:stylesheet>

这是示例 XML，我只是试图转义双引号并保留任何<P>标签，如果它们存在于 <Description> 和 <Insight> 标签中。这个特定的例子不必处理这个问题。

<?xml version="1.0" standalone="no" ?>
<!-- <!DOCTYPE message PUBLIC "-//TSN//DTD News 1.0/EN" "PlayerNotes.dtd"> -->
<message>
<XML_File_ID>64166.194</XML_File_ID>
<heading>FHB;PNOTES-YASIEL-PUIG</heading>
<category>MLB Fantasy Sports</category>
<sport>MLB</sport>
<NoteID>104585</NoteID>
<PlayerID>22526</PlayerID>
<TeamID>005</TeamID>
<Firstname>Yasiel</Firstname>
<Lastname>Puig</Lastname>
<Position>RF</Position>
<HotCold></HotCold>
<Status></Status>
<Description>The Dodgers have limited outfielder Yasiel Puig's throwing due to right shoulder inflammation, according to mlb.com.</Description>
<Insight>Puig (.319, 19 HR, 42 RBI, 11 SB) dealt with the same issue sporadically last season and it flared up again when he overextended himself during his first day of camp. "We don't think it's serious, but we need to find out," manager Don Mattingly said.</Insight>
<time_stamp>February 14, 2014, at 08:52 AM ET</time_stamp>
</message> 

Answer 1

<xsl:apply-templates select="normalize-space(Status/text())"/>在 XSLT 1.0 或 2.0 中不起作用，您只能apply-templates节点，例如 <xsl:apply-templates select="Status/text()"/>或<xsl:apply-templates select="Status"/>，然后在具有match="text()"或match="Status"的模板中，您可以调用函数规范化空间。

Answer 2

看起来您传递给 xsl：apply-templates 的 select 属性的参数不是节点。意思是，"normalize-space（heading/text（））"返回一个字符串而不是一个text（）节点。你应该使用"heading/text（）"代替。其余部分也是如此。

Answer 3

正如其他人已经指出的，您必须指定一个节点集作为 xsl：apply-templates 的 select 属性。另请注意，例如，<time_stamp> 元素没有子元素 - 因此 xPath 表达式time_stamp/*不选择任何内容。