[xsl] How to display figure if they are defined in the top of the XML f

Hi List
Needed another help. I don't have any Idea about this kind of 
concept. I even don't know how to process.
<!-- INPUT -->
<!DOCTYPE "xxx" "xxx.dtd"
[<!ENTITY F001 SYSTEM "images/fig1.jpg" NDATA JPEG>
<!ENTITY F002 SYSTEM "images/fig2.jpg" NDATA JPEG>
<!ENTITY per SYSTEM "images/per.jpg" NDATA JPEG>
]>
<main>

<docGroup>
<doc id="a1">
<figure entity="F001" id="fig1">
  <figDesc>figure 1</figDesc>
</figure>
<figure entity="F002" id="fig2">
  <figDesc>figure 2</figDesc>
</figure>
</doc>
<doc id="a2">
<figure entity="per" id="ufig">
  <figDesc>ufig</figDesc>
</figure>
</doc>
</docGroup>
</main>

<!-- OUTPUT -->
<img src="fig1.jpg"/>
<img src="fig2.jpg"/>
<img src="per.jpg"/>

Thanks


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