Random elements from the source xsd are not appearing in the DataMapper. There appears to be no identifying cause to the loss of elements.
Example: The xsd loaded for a dataset in adeptia has child elements under the 'comment' element. (i.e. comment) The xsd when viewed in xml spy clearly shows these elements. The xsd when viewed in DataMapper does not show the elements.
There might be some issues with the XSD that you are trying to load. Try loading Source/Target schema in data mapper after checking "On Demand(optimized)loading of XML Schema tree" under actions. For more information, refer to this post: http://support.adeptia.com/entries/21826713-on-demand-optimized-loading-of-xml-schema-tree