XPath: normalize-space 函数

返回去掉了前导、尾随和重复的空白的参数字符串

string normalize-space(string)

通过去掉前导和尾随空白并使用单个空格替换一系列空白字符，使空白标准化。如果省略了该参数，上下文节点的字符串值将标准化并返回。

以下函数调用返回“abc def”：

normalize-space("  abc    def  ")

如果参数不是字符串类型，将先使用 string() 函数转换为字符串，然后计算该转换的结果。此函数区分大小写。

Sample:

Xml:

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" 

href="normalizeSpace.xsl"?>      
<text>
    This is a
  test, with a   lot    of 
    irregular  spacing and
    waiting to be      normalizaed.


</text>

XSLT:

<?xml version='1.0'?>
<xsl:stylesheet version="1.0"           
     xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

  <xsl:output method="xml"   
       omit-xml-declaration="yes"/>

<xsl:template match="/text">
Unnormalized: 
"<xsl:value-of select='.'/>"
Normalized: "<xsl:value-of select='normalize-space()'/>"
</xsl:template>

</xsl:stylesheet>

Result:

Unormalized:
"
    This is a
  test, with a   lot    of
    irregular  spacing and
    waiting to be      normalizaed.

"
Normalized:
"This is a test, with a lot of irregular spacing and waiting to be normalized."

From: msdn: <http://msdn.microsoft.com/zh-cn/library/ms256063(VS.80).aspx>