supported fop features

Hi All,
I am wondering how can I find out which fop features are
supported-implemented when converting to rtf?
for example I tried to use the attribute padding-before="5cm" on a block
which had no effect when generating rtf but worked fine in the generated
pdf

pls see my example:
<xsl:stylesheet
     xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
     xmlns:fo="http://www.w3.org/1999/XSL/Format">

	<xsl:template match="MailLetterTemplate1">
	    <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
			<fo:layout-master-set>
				<fo:simple-page-master master-name="simpleA4" page-height="29.7cm"
page-width="21cm" margin-top="1.6cm" margin-bottom="2cm"
margin-left="3.2cm" margin-right="2.5cm">
					<fo:region-body/>
					<fo:region-after extent="0.3cm"/>
				</fo:simple-page-master>
			</fo:layout-master-set>
			<fo:page-sequence master-reference="simpleA4">
				<fo:static-content flow-name="xsl-region-after">
					<fo:block text-align="left" white-space-collapse="false"
text-decoration="no-line-through" font-weight="normal"
font-style="normal" font-size="10.0pt" font-family="Times New Roman"
color="#000000">
						Seite <fo:page-number/>
					</fo:block>
				</fo:static-content>
		        <fo:flow flow-name="xsl-region-body">
					<fo:block>
 		            	<fo:external-graphic height="24px" width="246px">
		            		<xsl:attribute name="src"> <xsl:value-of
select="LogoImagePath"/> </xsl:attribute>
		             	</fo:external-graphic>
					<fo:block padding-before="5cm" line-height="14pt" text-align="left"
font-weight="normal" font-style="normal" font-size="10.0pt"
font-family="Times New Roman" color="#000000"
linefeed-treatment="preserve" white-space-collapse="false"
white-space-treatment="preserve">
							<xsl:value-of select="FullAddressBlock"/>
					</fo:block>
	        	</fo:flow>
	      	</fo:page-sequence>
	    </fo:root>
	</xsl:template>
</xsl:stylesheet>

any help is verry appreciated


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