How to get repeating element in XSLT 2.0

I want to get the repeating "Author" element in the following XML structure against each product. How will i do it? I am using the following online tool for testing http://ift.tt/1boT3PS

XML

<OrderDocument>
  <OrderProduct>
    <Product>
      <ProductDescription>ProductDescription</ProductDescription>
      <Author>Author</Author>
      <Author>Author</Author>
    </Product>
   </OrderProduct>  
   <OrderProduct>
    <Product>
      <ProductDescription>ProductDescription</ProductDescription>
      <Author>Author</Author>
      <Author>Author</Author>
    </Product>
   </OrderProduct>  
   <OrderProduct>
    <Product>
      <ProductDescription>ProductDescription</ProductDescription>
      <Author>Author</Author>
      <Author>Author</Author>
    </Product>
   </OrderProduct>      
</OrderDocument>

XSLT File:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://ift.tt/tCZ8VR"  version="1.0">
  <xsl:template match="//OrderDocument">


   </xsl:template>
</xsl:stylesheet>

Output Required:

<Message>
 <Product>
           <Author>Author</Author>
          <Author>Author</Author>
 </Product>
  <Product>
           <Author>Author</Author>
          <Author>Author</Author>
 </Product>
</Message>