Development of [entity-field-Attribute-relation] to [XML] designer

Development of [entity-field-Attribute-relation] to [XML] designer

Prepare a vs.net ide designer to design XML files.
(Draw some entities, fields, properties, and relationship graphs, and then generate xml files.) How do you know?

1> Create> Project> Design Drawing> 〉
2> drag [entity] From the toolbar to the design interface, add [field] to [entity], and set [attribute] to [field].
3> add multiple [entities] to the design interface and organize their relationships.
4> save it as an XML file (entity-field-Attribute-link and other information)

Now we are looking at sharpdevelop.Source codeIt is estimated that this can be done, but it is still complicated.
Is there any open source that is closer to my goal?CodeWhat about it?
Have the developed designer code/or have the source code idea similar to the entity design?
(PS: I heard that nbear also has an Entity Designer. I don't know if I can learn from it .)

I haven't learned any new knowledge for a long time. I am outdated and need your help.
Thank you !!

Add a picture. When designing an object, it is like this interface:

XML can be generated:
<Entity name = "template">
<Attributegroup>
<Attribute id = "1" name = "connectionstring" type = "system. String">
<Attribute id = "2" name = "error" type = "system. String">
<Attribute id = "3" name = "generatedcode" type = "system. String">
<Attribute id = "4" name = "innerexception" type = "system. String">
<Attribute id = "5" name = "input" type = "system. String">
<Attribute id = "6" name = "issuccessfule" type = "system. String">
<Attribute id = "7" name = "output" type = "system. String">
<Attribute id = "8" name = "setting" type = "system. String">
</Attributegroup>
</Entity>

Written by some cool people !! :
Http://www.cnblogs.com/michael-zhang/articles/655267.html
Http://www.divil.co.uk/net/articles/designers/hosting.asp
Http://msdn.microsoft.com/msdnmag/issues/06/03/DesignerHosting/default.aspx