Я не знаю XQuery достаточно хорошо, чтобы выразить это решение XSLT в XQuery, но я думаю, что просто предоставление его может быть полезным.
Обратите внимание, что в типичных случаях реального мира слова отделяются болеечем один разделитель.Следующее решение обрабатывает в качестве разделителей все символы, указанные в параметре, и разбивает каждую строку на границе максимальной длины.Он является частью библиотеки функций / шаблонов FXSL для XSLT 1.0 или 2.0.
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:f="http://fxsl.sf.net/"
xmlns:ext="http://exslt.org/common"
xmlns:str-split2lines-func="f:str-split2lines-func"
exclude-result-prefixes="xsl f ext str-split2lines-func"
>
<xsl:import href="dvc-str-foldl.xsl"/>
<str-split2lines-func:str-split2lines-func/>
<xsl:output indent="yes" omit-xml-declaration="yes"/>
<xsl:template match="/">
<xsl:call-template name="str-split-to-lines">
<xsl:with-param name="pStr" select="/*"/>
<xsl:with-param name="pLineLength" select="60"/>
<xsl:with-param name="pDelimiters" select="' 	 '"/>
</xsl:call-template>
</xsl:template>
<xsl:template name="str-split-to-lines">
<xsl:param name="pStr"/>
<xsl:param name="pLineLength" select="60"/>
<xsl:param name="pDelimiters" select="' 	 '"/>
<xsl:variable name="vsplit2linesFun"
select="document('')/*/str-split2lines-func:*[1]"/>
<xsl:variable name="vrtfParams">
<delimiters><xsl:value-of select="$pDelimiters"/></delimiters>
<lineLength><xsl:copy-of select="$pLineLength"/></lineLength>
</xsl:variable>
<xsl:variable name="vResult">
<xsl:call-template name="dvc-str-foldl">
<xsl:with-param name="pFunc" select="$vsplit2linesFun"/>
<xsl:with-param name="pStr" select="$pStr"/>
<xsl:with-param name="pA0" select="ext:node-set($vrtfParams)"/>
</xsl:call-template>
</xsl:variable>
<xsl:for-each select="ext:node-set($vResult)/line">
<xsl:for-each select="word">
<xsl:value-of select="concat(., ' ')"/>
</xsl:for-each>
<xsl:value-of select="'
'"/>
</xsl:for-each>
</xsl:template>
<xsl:template match="str-split2lines-func:*" mode="f:FXSL">
<xsl:param name="arg1" select="/.."/>
<xsl:param name="arg2"/>
<xsl:copy-of select="$arg1/*[position() < 3]"/>
<xsl:copy-of select="$arg1/line[position() != last()]"/>
<xsl:choose>
<xsl:when test="contains($arg1/*[1], $arg2)">
<xsl:if test="string($arg1/word) or string($arg1/line/word)">
<xsl:call-template name="fillLine">
<xsl:with-param name="pLine" select="$arg1/line[last()]"/>
<xsl:with-param name="pWord" select="$arg1/word"/>
<xsl:with-param name="pLineLength" select="$arg1/*[2]"/>
</xsl:call-template>
</xsl:if>
</xsl:when>
<xsl:otherwise>
<xsl:copy-of select="$arg1/line[last()]"/>
<word><xsl:value-of select="concat($arg1/word, $arg2)"/></word>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<!-- Test if the new word fits into the last line -->
<xsl:template name="fillLine">
<xsl:param name="pLine" select="/.."/>
<xsl:param name="pWord" select="/.."/>
<xsl:param name="pLineLength" />
<xsl:variable name="vnWordsInLine" select="count($pLine/word)"/>
<xsl:variable name="vLineLength"
select="string-length($pLine) + $vnWordsInLine"/>
<xsl:choose>
<xsl:when test="not($vLineLength + string-length($pWord)
>
$pLineLength)">
<line>
<xsl:copy-of select="$pLine/*"/>
<xsl:copy-of select="$pWord"/>
</line>
</xsl:when>
<xsl:otherwise>
<xsl:copy-of select="$pLine"/>
<line>
<xsl:copy-of select="$pWord"/>
</line>
<word/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
, когда это преобразование применяется к следующему документу XML :
<text>
Dec. 13 — As always for a presidential inaugural, security and surveillance were
extremely tight in Washington, DC, last January. But as George W. Bush prepared to
take the oath of office, security planners installed an extra layer of protection: a
prototype software system to detect a biological attack. The U.S. Department of
Defense, together with regional health and emergency-planning agencies, distributed
a special patient-query sheet to military clinics, civilian hospitals and even aid
stations along the parade route and at the inaugural balls. Software quickly
analyzed complaints of seven key symptoms — from rashes to sore throats — for
patterns that might indicate the early stages of a bio-attack. There was a brief
scare: the system noticed a surge in flulike symptoms at military clinics.
Thankfully, tests confirmed it was just that — the flu.
</text>
желаемый результат получается (строки длиной не более 60 символов):
Dec. 13 — As always for a presidential inaugural, security
and surveillance were extremely tight in Washington, DC,
last January. But as George W. Bush prepared to take the
oath of office, security planners installed an extra layer
of protection: a prototype software system to detect a
biological attack. The U.S. Department of Defense, together
with regional health and emergency-planning agencies,
distributed a special patient-query sheet to military
clinics, civilian hospitals and even aid stations along the
parade route and at the inaugural balls. Software quickly
analyzed complaints of seven key symptoms — from rashes to
sore throats — for patterns that might indicate the early
stages of a bio-attack. There was a brief scare: the system
noticed a surge in flulike symptoms at military clinics.
Thankfully, tests confirmed it was just that — the flu.