Arbortext Editor and Arbortext Publishing Engine install a number of defined filters, and they are combined into content pipelines. The definitions can be found in the Arbortext-path\composerdirectory. You can use filters shipped with Arbortext Editor or develop your own filters. Each filter is defined in an .ent (XML Entity) file in the composer directory in the Arbortext installation. Any filter can be used in a new content pipeline. Put your custom filters in the custom\composer directory to make them automatically available.