Up to now, each new release of a DSSSL or XSL stylesheets had its
corresponding RPM package but with the same name (docbook-style-dsssl
resp. docbook-style-xsl). Therefore installing a new version would
overwrite the previous one.
Not necessarily. Use -i instead of -U to install the package.
Another policy, based on new version numbering scheme, is to suffix the
name with the version number minus the last dot (i.e.
docbook-style-xsl-1.50) so that different versions with different public
APIs could coexist on a single system.
The decision (LSB) was to install every version into a separate