Using DASL to search

Hello all.

I am trying to use DASL to search for the existence (and size) of a 
file. Following an example on the wiki 
(http://wiki.apache.org/jakarta-slide/DASLSearch), it seems that a query 
like the following should find a file named like "splash.bmp":

            String query =
                    + "<D:searchrequest xmlns:D =\"DAV:\">"
                    +     "<D:basicsearch>"
                    +         "<D:select>"
                    +             "<D:prop>"
                    +                 "<D:getcontentlength/>"
                    +             "</D:prop>"
                    +         "</D:select>"
                    +         "<D:from>"
                    +             "<D:scope>"
                    +                 "<D:href></D:href>"
                    +                 "<D:depth>1</D:depth>"
                    +             "</D:scope>"
                    +         "</D:from>"
                    +         "<D:where>"
                    +             "<D:contains>splash</D:contains>"
                    +         "</D:where>"
                    +     "</D:basicsearch>"
                    + "</D:searchrequest>";

Problem I am facing is that it doesn't find it (that file does exist at 
that depth) and trying other files, it seems to me that it is only 
including files of text/xml content type and not, say image/bmp or other 
things. Is that a default search type? And if so, how can I extend that 
to other/all types? If I search for, say, "plugin" and if I have 
"plugin.xml" there, it finds it. Just as a side note, I have all my 
files at /slide/files and I am using 2.2 built by WCK.

Thanks in advance,
Ali.