Abstract: Methods for creating deep web mining plans from dynamic content filters are described. Dynamic content filters allow for the creation of deep web mining plans that are able to be used even when the structure of documents including web pages and PDF files changes or to apply the same filters to different variants of the pages generated in deep web mining. By basing the dynamic filters on ontological and semantic information many common changes in web page structure, terminology and format can be made without preventing the extraction of data from these pages in deep web mining. Dynamic content filters may be created by persons without expertise in the creation of deep web mining data extraction plans.