These classes are in both modules:

org.apache.xml.resolver.Catalog
org.apache.xml.resolver.CatalogEntry
org.apache.xml.resolver.CatalogException
org.apache.xml.resolver.CatalogManager
org.apache.xml.resolver.Resolver
org.apache.xml.resolver.Version
org.apache.xml.resolver.apps.XParseError
org.apache.xml.resolver.apps.resolver
org.apache.xml.resolver.apps.xparse
org.apache.xml.resolver.apps.xread
org.apache.xml.resolver.helpers.Debug
org.apache.xml.resolver.helpers.Namespaces
org.apache.xml.resolver.helpers.PublicId
org.apache.xml.resolver.readers.CatalogReader
org.apache.xml.resolver.readers.DOMCatalogParser
org.apache.xml.resolver.readers.DOMCatalogReader
org.apache.xml.resolver.readers.ExtendedXMLCatalogReader
org.apache.xml.resolver.readers.OASISXMLCatalogReader
org.apache.xml.resolver.readers.SAXCatalogParser
org.apache.xml.resolver.readers.SAXCatalogReader
org.apache.xml.resolver.readers.SAXParserHandler
org.apache.xml.resolver.readers.TR9401CatalogReader
org.apache.xml.resolver.readers.TextCatalogReader
org.apache.xml.resolver.readers.XCatalogReader
org.apache.xml.resolver.tools.CatalogResolver
org.apache.xml.resolver.tools.ResolvingParser
org.apache.xml.resolver.tools.ResolvingXMLFilter
org.apache.xml.resolver.tools.ResolvingXMLReader

These are only in xml-resolver:

org.apache.xml.resolver.helpers.BootstrapResolver
org.apache.xml.resolver.helpers.FileURL

See https://hudson.qa.jboss.com/hudson/view/EAP6/view/EAP6-Miscellaneous/job/as7-tattletale/javadoc/classlocation/index.html