There are several XML schemas in server's docs/schemas that are in my opinion redundant and should be removed:

picketbox-security-domain-configuration_4_0.xsd - duplicates subsystem configuration in jboss-as-security_1_2.xsd
security-config_*.xsd - 3 schemas for old deployable security configuration descriptor. These kinds of deployments are afaik not supported in EAP 7.