General purpose XML tools can be used to work with the NeTEx XML schema and XML documents that conform to it, for example either the proprietary XML SPY (http://www.altova.com/xmlspy.html), or Oxygen (http://www.oxygenxml.com/) or see free tools at http://www.garshol.priv.no/download/xmltools/. A wide variety of mainstream XML tools are available to validate XML and to create bindings to specific programming languages (.NET, Java, PHP, C++).
To look at the design models, an interactive UML viewer such as Enterprise Architect (http://www.sparxsystems.com/) is extremely helpful, although a set of static web pages is also available.
To import or export transport data in NeTEx format, a number of suppliers are developing support for NeTEx for their existing products. New open source NeTEx products are also being developed such as CHOUETTE (http://www.chouette.mobi/en/). Sample mappings to a variety of national formats (VDV, BISON, etc) as well as GTFS have been developed and are included in the NeTEx standard. Further information on NeTEx implementations are available at http://netex-cen.eu/?page_id=65.