The WSDL editor abstracts much of the complexity of the WSDL standard, presenting structure of the WSDL without showing the unnecessary complexity. This provides a view that makes understanding and editing the your WSDL document simple. Access to the full range of related facets is available via the properties window and the WSDL can be edited directly within the Source view.
WSDL Graphical Notation Guide
Graphical Notation Overview