xsl:preserve-space
<xsl:preserve-space> The xsl:preserve-space element is used to keep white-space only nodes in the output. Note that the default is to leave white-space only nodes. Therefore, it is only necessary to use the xsl:preserve-space element when you use the xsl:strip-space element and wish to insure that certain white-space nodes are not removed. By white-space, we refer to carriage returns, line feeds, spaces …