For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:letsfindaway/openSUSE_Tumbleweed/home:letsfindaway.repo
zypper refresh
zypper install libxmlb
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:letsfindaway/16.0/home:letsfindaway.repo
zypper refresh
zypper install libxmlb
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:letsfindaway/15.6/home:letsfindaway.repo
zypper refresh
zypper install libxmlb
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:letsfindaway/15.5/home:letsfindaway.repo
zypper refresh
zypper install libxmlb