我的XML文件：
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<title> Oxford City Council Health and Environmental Protection Committee meeting. Sample containing about 11223 words speech recorded in public context
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<resp> Data capture and transcription
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<name> Oxford University Press
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<edition>BNC XML Edition, December 2006
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<extent> 11223 tokens; 11688 w-units; 482 s-units
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<distributor>Distributed under licence by Oxford University Computing Services on behalf of the BNC Consortium.
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<availability> This material is protected by international copyright laws and may not be copied or redistributed in any way. Consult the BNC Web Site at http://www.natcorp.ox.ac.uk for full licencing and distribution conditions.
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<placeName>Oxfordshire: Oxford
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<activity> Council Committee Meeting
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<classCode scheme="DLEE">S meeting
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<revisionDesc>
<change date="2006-10-21" who="#OUCS">Tag usage updated for BNC-XML
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<change date="2000-12-13" who="#OUCS">Last check for BNC World first release
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<change date="2000-09-06" who="#OUCS">Redo tagusage tables
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<change date="2000-09-01" who="#OUCS">Check all tagcounts
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<change date="2000-06-23" who="#OUCS">Resequenced s-units and added headers
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<change date="2000-01-29" who="#OUCS">Revised participant details
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<change date="2000-01-21" who="#OUCS">Added date info
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<change date="2000-01-09" who="#OUCS">Updated all catrefs
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<change date="2000-01-09" who="#OUCS">Updated REC elements to include tape number
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<change date="2000-01-08" who="#OUCS">Updated titles
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<change date="1999-12-25" who="#OUCS">corrected tagUsage
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<change date="1999-09-21" who="#UCREL">POS codes revised for BNC-2; header updated
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<change date="1994-11-27" who="#dominic">Initial accession to corpus
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<stext type="OTHERSP">
<div><!--
Oxford City Council: Health and Environmental Protection Committee (Nuclear Issues and Pollution Control) Sub-Committee.
Wednesday, 18th April 1990, 2.30pm, Town Hall.--><u who="PS6H7">
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<w c5="VVI" hw="welcome" pos="VERB">welcome
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<c c5="PUN">,
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<c c5="PUN">,
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如何创建一个包含它们发生次数的单词表，并按频率递减的顺序对它们进行排序？
答案 0 :(得分：0)
您可以通过以下方式计算输入文档中的单词：
获取所有文本节点（变量txtNodes）。出于性能原因，您可以限制
对包含其他东西的节点的选择不仅仅是＆＃34; white＆＃34;人物
（normalize-space()）。
提取单个字词并保存在words变量中。
将这些字词按其内容的大写字母（for-each-group）分组。
每组打印：
count(current-group())）。下面是示例XSLT代码：
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xsl:output method="text"/>
<xsl:template match="/">
<xsl:variable name="txtNodes" select="//text()[normalize-space()]" as="xs:string*"/>
<xsl:variable name="words" as="xs:string*">
<xsl:for-each select="$txtNodes">
<xsl:analyze-string select="." regex="\w+">
<xsl:matching-substring>
<xsl:value-of select="."/>
</xsl:matching-substring>
</xsl:analyze-string>
</xsl:for-each>
</xsl:variable>
<xsl:text>Words / # of occurrences:
</xsl:text>
<xsl:for-each-group select="$words" group-by="upper-case(.)">
<xsl:sort select="count(current-group())" data-type="number" order="descending"/>
<xsl:sort select="upper-case(.)"/>
<xsl:value-of select="concat(upper-case(substring(., 1, 1)), lower-case(substring(., 2)))"/>
<xsl:text> - </xsl:text>
<xsl:value-of select="count(current-group())"/>
<xsl:text>
</xsl:text>
</xsl:for-each-group>
</xsl:template>
</xsl:stylesheet>