Reading from a XML Source

I am trying read certain attribute from a XML Source based on a particular attribute.

My XML source has the following Structure:<Database ID = "1" Source = "ABC" ></Database><Database ID = "2" Source = "ABC" ></Database><Database ID = "3" Source = "DEF" ></Database>.

I would like to fetch the list of IDs filtering upon Source = "ABC". (which should idealy give me 1,2)

I tried using the For Each Nodelist Enumerator By specifying the Enumeration type as Node and IDrect Input for the OuterXpathString as DATABASE[@Source="ABC"].

The for each loop fails giving the following error. Data is invalid. line 1 position 1.

Can anyone help me out with the same. Is there any other way around to obtain the required result

Pranathi