Do we need those DTDs in src/main/dtd? We already have XSD schema, which is
a replacement, but it is only for map files (?). The reason I'm asking is
that for a long time (don't remember, when it started) Eclipse can't
validate those DTDs and gives me three irritating errors (one in each DTD),
and I can't find how to turn off that.
It'd be good if we had XSD for cayenne.xml and driver.xml as well, and
dropped DTDs (BTW I they are for 1.2 and obsolete anyways).