GML4J
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GML4J is a Java API for facilitating work with Geography Markup Language (GML). GML is a framework for encoding geography information in XML whose version 2.0 has been endorsed as a recommendation paper by Open GIS Consortium (OGC).
GML4J has been initially developed by Galdos Systems Inc. for experimental purposes. It is now an open-source project aimed at promoting and facilitating the use of GML.
GML4J is already a potent API whose strength is based on its schema-parsing capability. However, because its experimental origins this API will have to undergo a maturation phase to become reliable enough for use in production.