Azure-AddDisk.vm

<Disk xmlns="http://schemas.microsoft.com/windowsazure" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
    <OS>$osType</OS>
    <Label>$diskDescription</Label>
    <MediaLink>$blobUri</MediaLink>
    <Name>$diskName</Name>
</Disk>

using-velocity-template.java

VelocityEngine ve = new VelocityEngine();
ve.init();

Template t = ve.getTemplate("templates/Azure-AddDisk.vm");

VelocityContext context = new VelocityContext();
context.put("osType", "Windows");
context.put("diskDescription", "My First Azure Disk");
context.put("blobUri", "http://myStorageAccount.blob.core.windows.net/vhds/firstDisk.vhd");
context.put("diskName", "FirstDisk");

StringWriter writer = new StringWriter();
t.merge( context, writer );