這已經是一個非常基本的問題,但我真的很困難的解決方案。從下面的XML,我想只提取第一個實例,當我對tag="099"
匹配,並在marc:datafield
節點code="a"
屬性和marc:subfield
節點,分別在XSL中,如何根據多個屬性選擇一個值?
<?xml version="1.0" encoding="UTF-8" ?>
<marc:collection xmlns:marc="http://www.loc.gov/MARC21/slim"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.loc.gov/MARC21/slim http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd">
<marc:record>
...
<marc:datafield tag="079" ind1=" " ind2=" ">
<marc:subfield code="a">79927839</marc:subfield>
</marc:datafield>
<marc:datafield tag="099" ind1=" " ind2=" ">
<marc:subfield code="a">940002</marc:subfield>
</marc:datafield>
<marc:datafield tag="099" ind1=" " ind2=" ">
<marc:subfield code="a">940002*</marc:subfield>
</marc:datafield>
<marc:datafield tag="099" ind1=" " ind2=" ">
<marc:subfield code="a">940002**</marc:subfield>
...
所以,我試圖檢索第一個「940002」。使用下面的代碼:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="xs"
version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/"
xmlns:marc="http://www.loc.gov/MARC21/slim">
<xsl:output method="xml" encoding="UTF-8" indent="yes"/>
<xsl:template match="/">
<record xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/">
<!--identifier-->
<xsl:if test="/marc:collection/marc:record/marc:datafield/@tag='099'">
<xsl:element name="dc:identifier">
<xsl:if test="position()=1">
<xsl:value-of select="/marc:collection/marc:record/marc:datafield/marc:subfield/@code='a'"/>
</xsl:if>
</xsl:element>
</xsl:if>
...
然而,就是我得到的是:
<?xml version="1.0" encoding="UTF-8"?>
<record xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:dcterms="http://purl.org/dc/terms/"
xmlns:marc="http://www.loc.gov/MARC21/slim">
<dc:identifier>true</dc:identifier>
...
代替所需的:
<?xml version="1.0" encoding="UTF-8"?>
<record xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:dcterms="http://purl.org/dc/terms/"
xmlns:marc="http://www.loc.gov/MARC21/slim">
<dc:identifier>940002</dc:identifier>
...
我猜它一定是一個Xpath的問題,但...任何線索將不勝感激。
感謝
問得好(+1)。查看我的答案,獲取簡單的單線XPath表達式。 :) – 2010-08-09 20:26:39