XPath Problem - selecting the previos node

Hi,

Although I looked into the archive I couldn't find an appropriate response to
my question, which is quite simple...

I need to store the value of the first previous sibling, which doesn't start
with "-" in a variable.

Heres my XML:

<?xml version="1.0" encoding="UTF-8"?>
<norm xmlns="http://www.lexisnexis.at/schema/norm" id="abgb">
	<stichworte>
		<stichwort_alt>Abgerissenes Land 412(1)</stichwort_alt>
		<stichwort_alt>Abhandlung der Erbschaft 797</stichwort_alt>
		<stichwort_alt>Anerkennung der Vaterschaft 154</stichwort_alt>
		<stichwort_alt>-, Rechtswirksamerkldrung 164</stichwort_alt>
		<stichwort_alt>-, Widerspruch 163d, 163e</stichwort_alt>
...


I need to replace leading "-" with the first word of the previous sibling not
beginging with "-".
So my desired output should look like

	...
	<stichwort_alt>Anerkennung der Vaterschaft 154</stichwort_alt>
	<stichwort_alt> Anerkennung, Rechtswirksamerkldrung 164</stichwort_alt>
	<stichwort_alt> Anerkennung, Widerspruch 163d, 163e</stichwort_alt>


I tried to achieve this with the following stylesheet:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:ln="http://www.lexisnexis.at/schema/norm" exclude-result-prefixes="ln">
	<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
	<xsl:template match="node() | @*">
		<xsl:copy>
			<xsl:apply-templates select="@* | node()"/>
		</xsl:copy>
	</xsl:template>
	<xsl:template match="ln:stichworte">
		<xsl:element name="stichworte"
namespace="http://www.lexisnexis.at/schema/norm">
			<xsl:apply-templates select="ln:stichwort_alt"/>
		</xsl:element>
	</xsl:template>
	<xsl:template match="ln:stichwort_alt">

	<!-- I THINK HERE IS THE PROBLEM -->
		<xsl:variable name="sib"
select="preceding-sibling::ln:stichwort_alt[not(starts-with(., '-'))]"/>
		<xsl:element name="stichwort"
namespace="http://www.lexisnexis.at/schema/norm">
			<xsl:choose>
				<!-- Replacing leading "-," -->
				<xsl:when test="starts-with(., '-,')">
					<xsl:choose>
						<xsl:when test="contains(substring-before($sib, ' '), ',')">
							<xsl:value-of select="substring-before($sib, ',')"/>
							<xsl:text>,</xsl:text>
							<xsl:value-of select="substring-after(., '-,')"/>
						</xsl:when>
						<xsl:otherwise>
							<xsl:value-of select="substring-before($sib, ' ')"/>
							<xsl:text>,</xsl:text>
							<xsl:value-of select="substring-after(., '-,')"/>
						</xsl:otherwise>
					</xsl:choose>
				</xsl:when>
				<xsl:otherwise>
					<xsl:value-of select="normalize-space(text())"/>
				</xsl:otherwise>
			</xsl:choose>
		</xsl:element>
	</xsl:template>
</xsl:stylesheet>


I am always getting the first node in return. I tried different things with
position(), but it didn't work either...

Can you help me?
Thanks in advane.

Wbr,
Roman


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