  Quasirational presentations ($QR$-presentations) of (pro-$p$)groups are
studied. Such presentations include, in particular, aspherical presentations of
discrete groups and their subpresentations and pro-$p$-groups with a single
defining relation. Using schematization of $QR$-presentations we answer a
variation of J.-P. Serre's question on one-relator pro-$p$-groups.
