Please block tclxml and tcldom from devel. These have recently merged upstream and been renamed in Fedora to follow the Tcl packaging guidelines (BZ #476926)

The full list of packages to be blocked, including the subpackages in the spec files for the above two, includes:

tclxml
tclxml-devel
tclxml-libxml2
tclxml-expat
tcldom
tcldom-devel
tcldom-libxml2
tcldom-expat
tcldom-gui