In order to respond to increasing demand for indoor spatial information, an OGC standard called IndoorGML, has been recently published. It is an application schema of GML and based on the cellular space model, which represents an indoor space as a set of cells with their geometric, topological, and semantic attributes. Since we are at a beginning stage, very few tools supporting IndoorGML have been developed. In our talk, we will present an open source tool that we have been developing to provide a translating function between IndoorGML and other data formats. For example, it offers a Java package with a set of classes for indoorGML, called JavaIndoorGML. Once IndoorGML documents are mapped to Java instances of classes in JavaIndorGML, we are able to handle indoor spatial information with ease.