Updated README.md

Author: rmraya

README.md

@@ -2,6 +2,18 @@
 
 Java library for handling XML in [Maxprograms](https://maxprograms.com) projects.
 
+Although standard XML handling in Java is good, this library has features not available in Java SE:
+
+- Working support for [OASIS XML Catalogs](https://www.oasis-open.org/committees/entity/spec.html)
+- Default attribute values resolution when parsing XML files with RelaxNG grammars
+- XML indenter
+- XML characters validation
+
+Features in development:
+
+- DTD parser
+- Common XML Grammar handler for DTD, XML Schema and RelaxNG
+
 ## Building
 
 You need Java 17 and [Apache Ant 1.10.12](https://ant.apache.org) or newer