This is automatically called when saving a project file.
Your implementation must enclose all your data xml in a tag with the name provided in your getIdentifier method.
getIdentifier
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WorkspaceBytesPersistenceProvider provider = entry.getValue(); //Write Project file zipOut.putNextEntry(new ZipEntry("Workspace_" + workspace.getId() + "_" + name + "_bytes")); provider.writeBytes(outputStream, workspace); //Close Project file zipOut.closeEntry(); } }