对从参考列表收集的属性进行排序 [英] Sorting on attribute collected from reference list
问题描述
我正在尝试使用 XSLT 2.0 对已分类的 xml 元素列表进行排序.每个元素都有一个唯一的 ID,分类在包含这些和更多元素的另一个列表中定义.下面是一个起始 XML 文档的示例.我想要排序的部分是/Atlas/VisitedCities.应该按照世界区域和访问日期排序:
I am trying to sort a list of categorized xml elements, using XSLT 2.0. Each element has a unique ID and the categorization is defined in another list containing these and more elements. Here's an example of a starting XML document. The section that I want sorted is /Atlas/VisitedCities. It should be sorted according to area of the world and date of the visit:
<?xml version="1.0" encoding="UTF-8"?>
<Atlas>
<Cities>
<City id="1" worldPart="Africa">
<Name>Luxor</Name>
<Founded>-3200</Founded>
<Location>Egypt</Location>
</City>
<City id="2" worldPart="Africa">
<Name>Tripoli</Name>
<Founded>-700</Founded>
<Location>Libya</Location>
</City>
<City id="3" worldPart="Americas">
<Name>Cholula</Name>
<Founded>-200</Founded>
<Location>Mexico</Location>
</City>
<City id="4" worldPart="Americas">
<Name>Flores</Name>
<Founded>-1000</Founded>
<Location>Guatemala</Location>
</City>
<City id="5" worldPart="Europe">
<Name>Argos</Name>
<Founded>-5000</Founded>
<Location>Greece</Location>
</City>
<City id="6" worldPart="Europe">
<Name>Athens</Name>
<Founded>-4000</Founded>
<Location>Greece</Location>
</City>
</Cities>
<VisitedCities lastUpdate="2018-09-10">
<VisitedCity cityID="6">
<Date>1883-08-26</Date>
<Visitor>Dora</Visitor>
</VisitedCity>
<VisitedCity cityID="3">
<Date>1907-01-02</Date>
<Visitor>Nemo</Visitor>
</VisitedCity>
<VisitedCity cityID="4">
<Date>1940-02-08</Date>
<Visitor>Jimenez</Visitor>
</VisitedCity>
<VisitedCity cityID="2">
<Date>1886-06-10</Date>
<Visitor>James T. Kirk</Visitor>
</VisitedCity>
</VisitedCities>
</Atlas>
想要的输出是这样的:
<?xml version="1.0" encoding="UTF-8"?>
<Atlas>
<Cities>
<City id="1" worldPart="Africa">
<Name>Luxor</Name>
<Founded>-3200</Founded>
<Location>Egypt</Location>
</City>
<City id="2" worldPart="Africa">
<Name>Tripoli</Name>
<Founded>-700</Founded>
<Location>Libya</Location>
</City>
<City id="3" worldPart="Americas">
<Name>Cholula</Name>
<Founded>-200</Founded>
<Location>Mexico</Location>
</City>
<City id="4" worldPart="Americas">
<Name>Flores</Name>
<Founded>-1000</Founded>
<Location>Guatemala</Location>
</City>
<City id="5" worldPart="Europe">
<Name>Argos</Name>
<Founded>-5000</Founded>
<Location>Greece</Location>
</City>
<City id="6" worldPart="Europe">
<Name>Athens</Name>
<Founded>-4000</Founded>
<Location>Greece</Location>
</City>
</Cities>
<VisitedCities lastUpdate="2018-09-10">
<VisitedCity cityID="2">
<Date>1886-06-10</Date>
<Visitor>James T. Kirk</Visitor>
</VisitedCity>
<VisitedCity cityID="6">
<Date>1883-08-26</Date>
<Visitor>Dora</Visitor>
</VisitedCity>
<VisitedCity cityID="3">
<Date>1907-01-02</Date>
<Visitor>Nemo</Visitor>
</VisitedCity>
<VisitedCity cityID="4">
<Date>1940-02-08</Date>
<Visitor>Jimenez</Visitor>
</VisitedCity>
</VisitedCities>
</Atlas>
我正在努力处理的样式表 (XSLT 2.0) 看起来像这样:
The stylesheet (XSLT 2.0) that I am struggling with looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0">
<!-- Format output -->
<xsl:output method="xml" indent="yes"/>
<xsl:strip-space elements="*" />
<!-- Copy everything that does not match later templates. -->
<xsl:template match="node()|@*" priority="-1">
<xsl:copy>
<xsl:apply-templates select="node()|@*"/>
</xsl:copy>
</xsl:template>
<xsl:variable name="city.list" select="/Atlas/Cities"/>
<xsl:variable name="sort-order" as="element()*">
<wPart>Africa</wPart>
<wPart>Europe</wPart>
<wPart>Americas</wPart>
</xsl:variable>
<xsl:template match="/Atlas/VisitedCities">
<xsl:variable name="city-list" select="."/>
<xsl:copy>
<xsl:apply-templates select="@*"/>
<xsl:for-each select="$sort-order">
<xsl:variable name="this-wpart" select="./text()"/>
<!-- How to select VisitedCity based on info in other list??? -->
<xsl:apply-templates select="$city-list/VisitedCity[$city.list/City[@cityID=$city-list/VisitedCity/@cityID]/@worldPart=$this-wpart]">
<xsl:sort select="./Date"/>
</xsl:apply-templates>
</xsl:for-each>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
我想我明白为什么这个样式表不起作用(它根本不排序),因为我不知道如何在(最后一个)应用模板中进行选择.我不知道如何从这个表达式的内部引用最外面的元素.
I think I understand why this stylesheet will not work (it does not sort at all), as I don't know how to make the selection in the (last) apply-templates. I don't see how to refer to the outermost elements from the inner parts of this expression.
推荐答案
通过 id
属性设置一个键来引用 City
元素就足够了, 在 xsl:sort
select
表达式中引用 worldPart
属性.此外,您可以将大陆订单上的 for-each
替换为带有
It might suffice to set up a key to reference the City
elements by the id
attribute to then, in the xsl:sort
select
expression reference the worldPart
attribute. Additionally you could replace the for-each
on your continent order with an index-of()
call with
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="#all"
version="3.0">
<xsl:mode on-no-match="shallow-copy"/>
<xsl:output method="xml" indent="yes"/>
<xsl:key name="city-by-id" match="Cities/City" use="@id"/>
<xsl:variable name="sort-order" as="element()*">
<wPart>Africa</wPart>
<wPart>Europe</wPart>
<wPart>Americas</wPart>
</xsl:variable>
<xsl:template match="VisitedCities">
<xsl:copy>
<xsl:apply-templates select="VisitedCity">
<xsl:sort select="index-of($sort-order, key('city-by-id', @cityID)/@worldPart)"/>
<xsl:sort select="Date"/>
</xsl:apply-templates>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
https://xsltfiddle.liberty-development.net/eiZQaFJ
该完整示例是 XSLT 3,但要将其与 XSLT 2 一起使用,您只需将其中的 xsl:mode
声明替换为您的模板,您的模板前面带有注释 <!-- 复制与以后模板不匹配的所有内容.-->
,即带有身份转换模板.
That complete example is XSLT 3 but to use it with XSLT 2 you would just replace the xsl:mode
declaration in there with your template you have prefixed with the comment <!-- Copy everything that does not match later templates. -->
, that is, with the identity transformation template.
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