How can I validate my xdoc/fml source files?
Since version 2.1.1 of the site plugin, there is a validate configuration parameter that switches on xml validation (default is off). Note that in the current implementation of the parser used by Doxia, validation requires an independent parsing run, so that every source file is actually parsed twice when validation is switched on. If validation is switched on, all xml source files need a correct schema and/or DTD definition. See the Doxia documentation on validating xdocs, and the schema definitions for xdoc and fml.