my XML file contains single strings with upper and lower letters and I
need to split them into several words, always just before the first
upper letter starts.

Example:
<SomeTag>thisTextNeedToBeSplit</SomeTag>

My output should look like:

this Text Need To Be Split

Is there any possibility to do this with XSL methods?

t:\>type roland.xml
<SomeTag>thisTextNeedToBeSplit</SomeTag>
t:\>type roland.xsl
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="2.0">

<xsl:template match="/*">
  <xsl:value-of select="replace(.,'([a-z])([A-Z])','$1 $2')"/>
</xsl:template>

</xsl:stylesheet>
t:\>xslt2 roland.xml roland.xsl con
this Text Need To Be Split
t:\>

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