From How do you open XML Schema Explorer:
The XML Schema Explorer provides a hierarchal view of the schema set through a tree view. The XML Schema Explorer also provides search, filtering, navigation, and sorting. To access the XML Schema Explorer, do one of the following:
- If you are on the Start View, click the XML Schema Explorer link.
- If you are on the Graph View or the Content Model View and have nodes
in your workspace, use the context menu to select the XML Schema
Explorer.
- You can also select the XML Schema Explorerfrom the View menu.
- You can access the XML Schema Explorerfrom a .vb file that has a
Visual Basic XML literal associated with an .xsd file. To see the
schema set in the XML Schema Explorer, right click an XML node in an
XML literal or an XML namespace import and select the Show in Schema
Explorer command. For more information, see Integration of XML
Literals with XML Schema Explorer.
Drag the xsd into Visual Studio and then it will be under the View menu.