Two ways to call XSLT extension

[Karsten Theis]

Hi,

I'he done my first own XSTL extension function. It's a function with one
String parameter. It works fine if I call it this way:

...
<xsl:variable name="reflexionMatrix">
        <xsl:call-template name="getReflexionMatrix">
                <xsl:with-param>
                        <xsl:text>1 0 0 0 1 0 0 0 1</xsl:text>
                </xsl:with-param>
        </xsl:call-template>
</xsl:variable>
...

<xsl:template name="getReflexionMatrix">
        <xsl:param name="matrix"/>
        <xsl:value-of select="qmatrix:extractReflectionMatrix($matrix)" />
</xsl:template>



But it doen's work if I call it this way:

<xsl:variable name="MatrixRef">
        <xsl:call-template name="MatrixRef">
                <xsl:with-param>
                        <xsl:value-of select="concat('1, ' ', '0', ' ', '0', ' 
', '0', ' ', '1',
' ', '0', ' ', '0', ' ', '0', ' ', '1')"/>
                </xsl:with-param>
        </xsl:call-template>
</xsl:variable>

I get the error:
(Location of error unknown)XSLT-Fehler
(javax.xml.transform.TransformerException
): java.lang.NullPointerException
... finished



In my understanding of XSLT, both ways to call the function are exactly the
same! But there must be a difference!

I'm using xalan-j_2_4_D1

the java-function is declared as follows:
public static String extractReflectionMatrix(String p0)


Thanks for your help,

Karsten