In the setup instructions for IntelliJ (http://www.openlaszlo.org/lps4.9/docs/developers/editing-lzx.html#d0e127052) the location of the LZX DTD is listed as http://laszlosystems.com/lps-v1/tools/lzx.dtd
I found the following JIRA entries around the DTD generation, which is broken right now: http://jira.openlaszlo.org/jira/browse/LPP-7225 http://jira.openlaszlo.org/jira/browse/LPP-3179 http://jira.openlaszlo.org/jira/browse/LPP-3958 Some community members ran into the same problem in 2010: http://forum.openlaszlo.org/showthread.php?t=14020 http://thread.gmane.org/gmane.comp.java.openlaszlo.devel/25757 I found the following comment in this thread: http://article.gmane.org/gmane.comp.java.openlaszlo.devel/10954/match=lzx+dtd >> We *do* build lzx.dtd on linux-builder, as part of the nightly >> build process. It ends up in WEB-INF/lps/schema/lzx.dtd. I'll post >> it somewhere You should really get the DTD generation working, or remove the outdated information in chapter 50: http://www.openlaszlo.org/lps4.9/docs/developers/editing-lzx.html#d0e127052 L.
