[xsl] Push Processing

Hi List,

I am using push processing to output a resulting FO file. I use
apply-templates to build a table row and its cells. Normally I would build
the table by using a pull philosophy, but it would require a lot of rework
to the stylesheet. My problem occurs when I have an optional element. Using
apply-templates, my output my leave out a cell, causing my cell alignment to
be off. The below is a dumb-down version for example:

<item-entry>
	<item>
		<label>1</label>
		<code>234</code>
		<no>12345</no>
		<partno>12-3456-0981-1</partno>
		<name>Widget</name>
		<qty>3</qty>
	</item>
</item-entry>

Suppose I am missing <nsn>, I need to apply an empty cell. How can I do this
using push processing?

	<xsl:template match="item-entry">
		<xsl:apply-templates/>
	</xsl:template>
	<xsl:template match="item">
		<fo:table-row>
			<xsl:apply-templates/>
		</fo:table-row>
	</xsl:template>
	<xsl:template match="label">
		<fo:table-cell>
			<fo:block>
				<xsl:value-of select="."/>
			</fo:block>
		</fo:table-cell>
	</xsl:template>
	<xsl:template match="code">
		<fo:table-cell>
			<fo:block>
				<xsl:value-of select="."/>
			</fo:block>
		</fo:table-cell>
	</xsl:template>
	<xsl:template match="nsn">
		<fo:table-cell>
			<fo:block>
				<xsl:value-of select="."/>
			</fo:block>
		</fo:table-cell>
	</xsl:template>
	<xsl:template match="partno">
		<fo:table-cell>
			<fo:block>
				<xsl:value-of select="."/>
			</fo:block>
		</fo:table-cell>
	</xsl:template>
	<xsl:template match="name">
		<fo:table-cell>
			<fo:block>
				<xsl:value-of select="."/>
			</fo:block>
		</fo:table-cell>
	</xsl:template>
	<xsl:template match="qty">
		<fo:table-cell>
			<fo:block>
				<xsl:value-of select="."/>
			</fo:block>
		</fo:table-cell>
	</xsl:template>

Thanks,

Phil