http://openclipart.org/people/molumen/molumen_lollipops_dispenser.svg created in Inkscape 0.46 preview1 (on Windows) and saved as plain SVG appears to be not valid.
 
I tested it with http://validator.w3.org/
 
Here's what I got:
 
Line 16, Column 6: there is no attribute "id".
        id="perspective443" /><inkscape:perspective
 
Line 16, Column 24: element "inkscape:perspective" undefined.
        id="perspective443" /><inkscape:perspective
 
Line 17, Column 25: element "inkscape:perspective" undefined.
        id="perspective4412" /><inkscape:perspective
 
Line 18, Column 25: element "inkscape:perspective" undefined.
        id="perspective8338" />
 
Line 156, Column 18: there is no attribute "inkscape:label".
        inkscape:label="filter16913"
 
Line 164, Column 22: there is no attribute "inkscape:collect".
        inkscape:collect="always" /></filter><linearGradient
 
 
 
Molumen