/usr/share/libvirt/schemas/ is in libvirt-bin 0.9.12.3-1+deb7u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/libvirt/schemas/basictypes.rng
/usr/share/libvirt/schemas/capability.rng
/usr/share/libvirt/schemas/domain.rng
/usr/share/libvirt/schemas/domaincommon.rng
/usr/share/libvirt/schemas/domainsnapshot.rng
/usr/share/libvirt/schemas/interface.rng
/usr/share/libvirt/schemas/network.rng
/usr/share/libvirt/schemas/networkcommon.rng
/usr/share/libvirt/schemas/nodedev.rng
/usr/share/libvirt/schemas/nwfilter.rng
/usr/share/libvirt/schemas/secret.rng
/usr/share/libvirt/schemas/storageencryption.rng
/usr/share/libvirt/schemas/storagepool.rng
/usr/share/libvirt/schemas/storagevol.rng