Looking to understand how this works?

Americo Albuquerque sent me some wonderful code to lay out outlined steps
using table/cells and a space variable. Although I understand there are
alternatives, I actually could understand most of this!  But I would love to
understand:

(1) The significance of the math to calculate the space variable? Take the
count (ie level) of the step multiply by 12 + 1 multiply by 7...just
curious.

(2) What does the line <xsl:apply-templates select="*[not(self::step)]"/>
mean?

Thanks.  Kathy

Here it is:

<xsl:variable name="space" select="(count(ancestor::step) * 12 + 1) * 7"/>
<tr>   
<td width="5%" valign="top">
<xsl:apply-templates select="@ckbox[.='yes']"/>   
</td>   
<td valign="top">
        <table width="100%" border="0" cellpadding="0">
        <tr>      
        <td valign="top" width="{$space}">
                <table border="0" cellpadding="0">
                <tr>         
                <td valign="top" width="{$space}">&#160;&#160;
</td>
                <td valign="top">
                <xsl:number level="multiple" count="step"
format="1.1"/>
                <xsl:if test="not(ancestor::step)">
                        <xsl:text>.</xsl:text>
                </xsl:if>         
                <xsl:text>&#160;&#160;</xsl:text>
                        </td>
                        </tr>      
                        </table>      
                </td>      
                <td>       
                <xsl:apply-templates select="*[not(self::step)]"/>      
        </td>     
        </tr>    
        </table>   
</td>  
</tr>  
                <xsl:apply-templates select="step"/> 
        </xsl:template> 


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