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XSLT Confusion with xsl:apply-templates

问答 作者：

I have an XML file with this format:

<?xml version="1.0" encoding="utf-8" ?>
<OpacResult>
<valueObjects class="list">
    <Catalog>
        <notes>
            Daily newsletter available via e-mail.&#xd;
            IP authenticated. Login not needed within firm.
        </notes>
        <title>Health law360. </title>
        <url>http://health.law360.com/</url>
        <catalogTitles class="list">
            <CatalogTitle>
                <uuid>e5e2bc53ac1001f808cddc29f93ecad8</uuid>
                <timeChanged class="sql-timestamp">2010-12-14 09:17:10.707</timeChanged>
                <timeEntered class="sql-timestamp">2010-12-14 09:17:10.707</timeEntered>
                <whoChanged>B23DE2FFE8DD49B0B0A03D1FEB3E7DA2</whoChanged>
                <whoEntered>B23DE2FFE8DD49B0B0A03D1FEB3E7DA2</whoEntered>
                <updateSearchIndex>true</updateSearchIndex>
                <corpId>RopesGray</corpId>
                <catalogUuid>a20b6b4bac1001f86d28280ed0ebeb9e</catalogUuid>
                <type>O</type>
                <title>Law 360. Health law.</title>
            </CatalogTitle>
            <CatalogTitle>
                <uuid>e5e2bc53ac1001f808cddc299ddfe49d</uuid>
                <timeChanged class="sql-timestamp">2010-12-14 09:17:10.707</timeChanged>
                <timeEntered class="sql-timestamp">2010-12-14 09:17:10.707</timeEntered>
                <whoChanged>B23DE2FFE8DD49B0B0A03D1FEB3E7DA2</whoChanged>
                <whoEntered>B23DE2FFE8DD49B0B0A03D1FEB3E7DA2</whoEntered>
                <updateSearchIndex>true</updateSearchIndex>
                <corpId>RopesGray</corpId>
                <catalogUuid>a20b6b4bac1001f86d28280ed0ebeb9e</catalogUuid>
                <type>O</type>
                <title>Health law 360</title>
            </CatalogTitle>
            <CatalogTitle>
                <uuid>e5e2bc53ac1001f808cddc29ec1d959b</uuid>
                <timeChanged class="sql-timestamp">2010-12-14 09:17:10.707</timeChanged>
                <timeEntered class="sql-timestamp">2010-12-14 09:17:10.707</timeEntered>
                <whoChanged>B23DE2FFE8DD49B0B0A03D1FEB3E7DA2</whoChanged>
                <whoEntered>B23DE2FFE8DD49B0B0A03D1FEB3E7DA2</whoEntered>
                <updateSearchIndex>true</updateSearchIndex>
                <corpId>RopesGray</corpId>
                <catalogUuid>a20b6b4bac1001f86d28280ed0ebeb9e</catalogUuid>
                <type>O</type>
                <title>Health law three hundred sixty</title>
            </CatalogTitle>
        </catalogTitles>
        <catalogUrls class="list"/>
        <gmd>
            <uuid>f8f123acc0a816070192e296a6a71715</uuid>
            <timeChanged class="sql-timestamp">2006-10-10 15:23:37.813</timeChanged>
            <timeEntered class="sql-timestamp">2005-01-27 00:00:00.0</timeEntered>
            <whoChanged>25db9fcd3fd247f4a20485b40cc134ad</whoChanged>
            <whoEntered>user</whoEntered>
            <updateSearchIndex>true</updateSearchIndex>
            <corpId>RopesGray</corpId>
            <isRuleDefault>false</isRuleDefault>
            <ruleName>text</ruleName>
            <term>electronic resource</term>
            <preferCollection>false</preferCollection>
            <isTechnicalManual>false</isTechnicalManual>
            <sip2IsMagnetic>false</sip2IsMagnetic>
        </gmd>
        <issues class="list"/>
    <开发者_如何学C;/Catalog>
</valueObjects>
</OpacResult>

As you can see, there are other elements under sibling nodes, but I don't care about these and only want to see the first one.

I'm using this code to call a template with the string of desired elements as the parameter and a template to loop through the asterisk-delimited string parameter: (title*url*notes*)

<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:param name="columns" />
<xsl:template match="/OpacResult/valueObjects">
    <html>
        <body>
            <table border="1">

                <!-- Header row -->
                <tr>
                    <xsl:call-template name="print-headers">
                        <xsl:with-param name="columns" select="$columns"/>
                    </xsl:call-template>
                </tr>

                <!-- Value rows -->
                <xsl:for-each select="Catalog">
                    <tr>
                        <xsl:call-template name="print-values">
                            <xsl:with-param name="columns" select="$columns"/>
                        </xsl:call-template>
                    </tr>
                </xsl:for-each>
            </table>
        </body>
    </html>
</xsl:template>

<!-- Split up string of column names and create header field names based on element names-->
<xsl:template name="print-headers">
    <xsl:param name="columns"/>

    <xsl:variable name="newList" select="$columns"/>
    <xsl:variable name="first" select="substring-before($newList, '*')" />
    <xsl:variable name="remaining" select="substring-after($newList, '*')" />

    <th>
        <xsl:apply-templates select="Catalog/*[name()=$first]">
            <xsl:with-param name="header">true</xsl:with-param>
        </xsl:apply-templates>
    </th>

    <xsl:if test="$remaining">
        <xsl:call-template name="print-headers">
            <xsl:with-param name="columns" select="$remaining"/>
        </xsl:call-template>
    </xsl:if>

</xsl:template>

<xsl:template name="print-values">
    <xsl:param name="columns"/>

    <xsl:variable name="newList" select="$columns"/>
    <xsl:variable name="first" select="substring-before($newList, '*')" />
    <xsl:variable name="remaining" select="substring-after($newList, '*')" />

    <td>
        <xsl:apply-templates select="Catalog/*[name()=$first]"/>
    </td>

    <xsl:if test="$remaining">
        <xsl:call-template name="print-values">
            <xsl:with-param name="columns" select="$remaining"/>
        </xsl:call-template>
    </xsl:if>

</xsl:template>

<xsl:template match="title">
    <xsl:param name="header"/>

    <xsl:choose>
        <xsl:when test="$header='true'">
            <xsl:text>Title</xsl:text>
        </xsl:when>
        <xsl:otherwise>
            <a>
                <xsl:attribute name="href">
                    <xsl:value-of select="//*[name()='url']"/>
                </xsl:attribute>
                <xsl:value-of select="//*[name()='title']"/>
            </a>
        </xsl:otherwise>
    </xsl:choose>
</xsl:template>

<xsl:template match="url">
    <xsl:param name="header"/>

    <xsl:choose>
        <xsl:when test="$header='true'">
            <xsl:text>URL</xsl:text>
        </xsl:when>
        <xsl:otherwise>
            <a>
                <xsl:attribute name="href">
                    <xsl:value-of select="//*[name()='url']"/>
                </xsl:attribute>
                <xsl:value-of select="//*[name()='url']"/>
            </a>
        </xsl:otherwise>
    </xsl:choose>
</xsl:template>

<xsl:template match="notes">
    <xsl:param name="header"/>

    <xsl:choose>
        <xsl:when test="$header='true'">
            <xsl:text>Notes</xsl:text>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select="//*[name()='notes']"/>
        </xsl:otherwise>
    </xsl:choose>
</xsl:template>

<xsl:template match="holdingNotes">
    <xsl:param name="header"/>

    <xsl:choose>
        <xsl:when test="$header='true'">
            <xsl:text>Holding Notes</xsl:text>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select="//*[name()='holdingNotes']"/>
        </xsl:otherwise>
    </xsl:choose>
</xsl:template>

<xsl:template match="relatedUrl">
    <xsl:param name="header"/>

    <xsl:choose>
        <xsl:when test="$header='true'">
            <xsl:text>Related URL</xsl:text>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select="//*[name()='relatedUrl']"/>
        </xsl:otherwise>
    </xsl:choose>
</xsl:template>

<xsl:template match="bibliographicType/hasDataFile">
    <xsl:param name="header"/>

    <xsl:choose>
        <xsl:when test="$header='true'">
            <xsl:text>File</xsl:text>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select="Catalog/*[name()='hasDataFile']"/>
        </xsl:otherwise>
    </xsl:choose>
</xsl:template>

The only way I can access this template is to use the //*[name()=$first] syntax to extract the value of the element based on the name from the $first parameter.

Any help is greatly appreciated. Thanks very much in advance. Not including the full XML as there are thousands of lines of unnecessary text.

This stylesheet:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:h="header"
 exclude-result-prefixes="h">
    <h:h>
        <title>Title</title>
        <url>URL</url>
        <notes>Notes</notes>
    </h:h>
    <xsl:param name="pColumns" select="'title url notes'"/>
    <xsl:template match="/OpacResult/valueObjects">
        <html>
            <body>
                <table border="1">
                    <tr>
                        <xsl:apply-templates
                             select="document('')/*/h:h"
                             mode="filter"/>
                    </tr>
                    <xsl:apply-templates/>
                </table>
            </body>
        </html>
    </xsl:template>
    <xsl:template match="Catalog">
        <tr>
            <xsl:call-template name="filter"/>
        </tr>
    </xsl:template>
    <xsl:template match="h:h/*">
        <th>
            <xsl:value-of select="."/>
        </th>
    </xsl:template>
    <xsl:template match="Catalog/*">
        <td>
            <xsl:value-of select="."/>
        </td>
    </xsl:template>
    <xsl:template match="node()" mode="filter" name="filter">
        <xsl:apply-templates select="*[contains(
                                          concat(' ',$pColumns,' '),
                                          concat(' ',name(),' '))]">
            <xsl:sort select="substring-before(
                                 concat(' ',$pColumns,' '),
                                 concat(' ',name(),' '))"/>
        </xsl:apply-templates>
    </xsl:template>
</xsl:stylesheet>

Output:

<html>
    <body>
        <table border="1">
            <tr>
                <th>Title</th>
                <th>URL</th>
                <th>Notes</th>
            </tr>
            <tr>
                <td>Health law360. </td>
                <td>http://health.law360.com/</td>
                <td>             Daily newsletter available via e-mail.
             IP authenticated. Login not needed within firm.         </td>
            </tr>
        </table>
    </body>
</html>

Note: Inline data for headers, pseudo sequence parameter for filtering and sorting, modes not for processing the same element in different way but for processing different elements in the same way also.

I've found a solution, but I'm sure it's not the best way to do it. Within the templates for each of my expected fields, I have added:

<xsl:if test=position()=1">
    .. process data here ..
</xsl:if>

Ideally, there would be a way to tell this to process only the first element it finds:

<th>
    <xsl:apply-templates select="//*[name()=$first]">
        <xsl:with-param name="header">true</xsl:with-param>
    </xsl:apply-templates>
</th>

Edit: As I suspected, this will not work when there is more than one Catalog element to parse. So instead of grabbing the first element for each catalog parent element, it's grabbing the first element in the document every time

继续阅读：xslt

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