/usr/share/arc/schema/ is in libarccommon3 4.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/arc/schema/ARCSHCLegacy.xsd
/usr/share/arc/schema/ArcAuthZ.xsd
/usr/share/arc/schema/ArcPDP.xsd
/usr/share/arc/schema/DelegationPDP.xsd
/usr/share/arc/schema/DelegationSH.xsd
/usr/share/arc/schema/GLUE2.xsd
/usr/share/arc/schema/PDPServiceInvoker.xsd
/usr/share/arc/schema/SAMLTokenSH.xsd
/usr/share/arc/schema/SimpleListPDP.xsd
/usr/share/arc/schema/UsernameTokenSH.xsd
/usr/share/arc/schema/X509TokenSH.xsd
/usr/share/arc/schema/XACMLPDP.xsd
/usr/share/arc/schema/a-rex.xsd
/usr/share/arc/schema/a-rex_infoprovider.xsd
/usr/share/arc/schema/a-rex_lrms.xsd
/usr/share/arc/schema/arcconfig.xsd
/usr/share/arc/schema/arguspdpclient.xsd
/usr/share/arc/schema/arguspepclient.xsd
/usr/share/arc/schema/base.xsd
/usr/share/arc/schema/echo.xsd
/usr/share/arc/schema/gsi.xsd
/usr/share/arc/schema/http.xsd
/usr/share/arc/schema/identitymap.xsd
/usr/share/arc/schema/infosys.xsd
/usr/share/arc/schema/javawrapper.xsd
/usr/share/arc/schema/loader.xsd
/usr/share/arc/schema/msgvalidator.xsd
/usr/share/arc/schema/pythonwrapper.xsd
/usr/share/arc/schema/tcp.xsd
/usr/share/arc/schema/tls.xsd