Get the count of nodes in an XML field XQuery SQL Server 2008

Question

I am trying to get the count of nodes in an XML field. but I always see 0 as the result. Here is how my query looks like.

 DECLARE @XmlTable TABLE (XmlResult XML)
INSERT INTO @XmlTable EXECUTE [dbo].usp_GetBooks @EditionId=400
--select * from  @XmlTable
SELECT
--Count number of nodes
  COUNT(*) AS BooksCount
FROM
(
SELECT XmlResult FROM @XmlTable
) AS XmlTable(XmlColumn)
CROSS APPLY XmlColumn.nodes('./books/book') XmlTableFunction(XmlColumn2);

My XML Looks like :

<Version number ="1"> 
<books>
<book>
  <name> </name>
  <author></author>
</book>
<book>
  <name> </name>
  <author></author>
</book>
</books>
</Version>