For your testing, the structure is: 

<?xml version="1.0"?>

<root>
 <dynamic-element name="content" type="text_area" index-type="" repeatable="false">
  <meta-data>
   <entry name="displayAsTooltip"><![CDATA[false]]></entry>
   <entry name="required"><![CDATA[false]]></entry>
   <entry name="instructions"><![CDATA[]]></entry>
   <entry name="label"><![CDATA[Content]]></entry>
   <entry name="predefinedValue"><![CDATA[]]></entry>
  </meta-data>
 </dynamic-element>
 <dynamic-element name="dl" type="document_library" index-type="" repeatable="true">
  <meta-data>
   <entry name="displayAsTooltip"><![CDATA[true]]></entry>
   <entry name="required"><![CDATA[false]]></entry>
   <entry name="instructions"><![CDATA[]]></entry>
   <entry name="label"><![CDATA[DocumentLibraryField]]></entry>
   <entry name="predefinedValue"><![CDATA[]]></entry>
  </meta-data>
 </dynamic-element>
 <dynamic-element name="imupload" type="image" index-type="" repeatable="false">
  <meta-data>
   <entry name="displayAsTooltip"><![CDATA[true]]></entry>
   <entry name="required"><![CDATA[false]]></entry>
   <entry name="instructions"><![CDATA[]]></entry>
   <entry name="label"><![CDATA[ImageField]]></entry>
   <entry name="predefinedValue"><![CDATA[]]></entry>
  </meta-data>
 </dynamic-element>
</root>

Template is: 
<p>$content.getData()</p>
#foreach($dls in $dl.getSiblings())
 <a href="$dls.getData()">dl</a><br/>
#end

<img src="$imupload.getData()"/>