I want to xlog uri and myself variables, how to do this?

Here are some ways failed, separated with blank lines:

#xlog("L_NOTICE", "DIMS: uri (" + $uri + ") == myself (" + $myself + " block...");

#xlog("L_NOTICE", "DIMS: uri (" + uri + ") == myself (" + myself + " block...");

#$var(myuri) = uri;
#$var(mymyself) = myself;
#xlog("L_NOTICE", "DIMS: uri ($var(myuri)) == myself ($var(mymyself)) block...");

#xlog("L_NOTICE", "DIMS: uri ($uri) == myself ($myself) block...");

#xlog("L_NOTICE", "DIMS: uri ($var(uri)) == myself ($var(myself)) block...");

#$avp(myuri) = uri;
#$avp(mymyself) = myself;
#xlog("L_NOTICE", "DIMS: uri ($vap(myuri)) == myself ($avp(mymyself)) block...");