Selecting null value from XML in SQL Server

Question

I\'m trying to select from XML that has a null as one of the attributes. Instead of returning a null, it returns a 0. What am I doing wrong?
See code below to replicate:

Answer 1

http://go4answers.webhost4life.com/Example/including-null-columns-empty-elements-125474.aspx

[not(@xsi:nil = "true")]

This will select null. By the way author code has a typo

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instace"

instance is misspelled as instace

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

Working version of author code

declare @a xml
            select @a = '
              
                1
                1
              
              
                
                2
              
              
                3
                3
              
            '

             select ParamValues.TaskChainerTask.value('./Property1[1][not(@xsi:nil = "true")]','int') as Property1,
                    ParamValues.TaskChainerTask.value('./Property2[1][not(@xsi:nil = "true")]','int') as Property2
               from @a.nodes('(/TestSet/Element)') as ParamValues(TaskChainerTask)