能否使用XSLT 3.0实现输入日期与节假日列表的匹配判断并输出布尔标识？

Absolutely! XSLT 3.0 is a great fit for this task—its built-in support for loading external documents, sequence operations, and clean node processing makes this straightforward. Let’s walk through a complete solution tailored to your requirements:

• First, we’ll load the holiday list XML and store its dates in a sequence for fast lookups.
• Next, we’ll process each entry from your input data XML, checking if the Input_date exists in the holiday sequence.
• Finally, we’ll generate the output XML with the original date and a corresponding boolean flag.

Complete XSLT 3.0 Code #

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <!-- Store all holiday dates in a sequence for efficient membership checks -->
    <xsl:variable name="holiday-dates" as="xs:string*">
        <xsl:sequence select="document('holidays.xml')/root/row/Date/text()"/>
    </xsl:variable>

    <!-- Match the root of the input data XML -->
    <xsl:template match="/Report_data">
        <Data>
            <!-- Process each Report_entry in the input -->
            <xsl:for-each select="Report_entry">
                <output>
                    <!-- Copy the original Input_date element -->
                    <xsl:copy-of select="Input_date"/>
                    <!-- Add the Flag element with the holiday check result -->
                    <Flag>
                        <xsl:value-of select="if (Input_date/text() = $holiday-dates) then 'True' else 'False'"/>
                    </Flag>
                </output>
            </xsl:for-each>
        </Data>
    </xsl:template>
</xsl:stylesheet>

Key Details Explained #

1. Loading the Holiday List

   • The document('holidays.xml') function loads your external holiday XML file. Ensure the filename/path matches where you’ve stored your holiday list relative to the XSLT processor’s working directory.
   • We store all holiday dates in the $holiday-dates sequence, which acts like a set for near-instant membership checks.

2. Date Matching Logic

   • The expression Input_date/text() = $holiday-dates checks if the input date exists in the holiday sequence. We wrap this in an if/else to output capitalized True/False as specified in your requirement.
   • If you prefer lowercase true/false (the default XSLT boolean output), you can simplify this to <xsl:value-of select="Input_date/text() = $holiday-dates"/>.

3. Output Structure

   • We mirror your expected output format exactly: wrapping each result in an <output> element, retaining the original <Input_date>, and adding the <Flag> element with the check result.

How to Use #

1. Save your holiday list as holidays.xml (adjust the filename in the document() function if needed).
2. Save the XSLT above as holiday-check.xsl.
3. Run the transformation using an XSLT 3.0-compliant processor (like Saxon HE/PE/EE, or Altova XMLSpy). For example, with Saxon from the command line:

   java -jar saxon-he-12.4.jar -s:input-data.xml -xsl:holiday-check.xsl -o:output.xml
   

Example Input/Output #

Input Data XML (input-data.xml):

<Report_data>
  <Report_entry>
    <Input_date>2021-01-01</Input_date>
  </Report_entry>
  <Report_entry>
    <Input_date>2021-01-15</Input_date>
  </Report_entry>
</Report_data>

Holiday XML (holidays.xml):

<root>
  <row>
    <Date>2021-01-01</Date>
  </row>
  <row>
    <Date>2021-02-05</Date>
  </row>
</root>

Output XML (output.xml):

<Data>
  <output>
    <Input_date>2021-01-01</Input_date>
    <Flag>True</Flag>
  </output>
  <output>
    <Input_date>2021-01-15</Input_date>
    <Flag>False</Flag>
  </output>
</Data>

内容的提问来源于stack exchange，提问作者Adee