Is the new data EnterpriseserverDataItem class limited to establishing connections to the StrataFrame Enterprise Server or will it allow connections to other web services?
The EnterpriseServerDataSourceItem is exclusive to StrataFrame's Middle Tier Enterprise Server. There is a lot of logic specific to the Middle Tier Enterprise server just as there would be in SqlDataSourceItem or VFPDataSourceItem. In fact, there is actually more because there is logic for encryption and custom serialization to make things as fast as possible.
If you want to talk to a disparate web services not related to StrataFrame, you will want to create your own data source item. Basically you will inherit the DbDataSourceItem and start adding your functionality. Obviously this is a bit of a simple explanation. Here is the problem with us just creating a "one class does it all" data source to talk to a web service....every connection is different. It depends on how it has been exposed and developed as to what is required by the data acces layer.