<?xml version="1.0" encoding="UTF-8"?>
<root>
<main_list>
<item_main_list>
	<id>id_1</id>
	<sub_list>
		<item_sub_list><val>val_sublist_1_1</val></item_sub_list>
		<item_sub_list><val>val_sublist_1_2</val></item_sub_list>
	</sub_list>
</item_main_list>
<item_main_list>
	<id>id_2</id>
	<sub_list>
		<item_sub_list><val>val_sublist_2_1</val></item_sub_list>
	</sub_list>
</item_main_list>
</main_list>
</root>

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet    xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">    
<xsl:template match="root">        
	<root>            
		<table>                
			<rows>               
				<xsl:apply-templates select="main_list/item_main_list/sub_list/item_sub_list">
					<xsl:with-param name="paramId" select="main_list/item_main_list/id" />               
				</xsl:apply-templates>            
				</rows>         
		</table>            
	</root>    
</xsl:template>	    
	  
	<xsl:template match="main_list/item_main_list/sub_list/item_sub_list">        
		<xsl:param name="paramId" />      
		<row>            
			<row_id><xsl:value-of select="$paramId" /> </row_id>
			<row_value> <xsl:value-of select="val" /> </row_value>						
		</row>    
	</xsl:template>	    
</xsl:stylesheet>

<?xml version="1.0"?>
<root>
<table>
<rows>
<row><row_id>id_1</row_id><row_value>val_sublist_1_1</row_value></row>
<row><row_id>id_1</row_id><row_value>val_sublist_1_2</row_value></row>
<row><row_id>id_1</row_id><row_value>val_sublist_2_1</row_value></row>
</rows></table></root>