The default namespace for all the classes in the add-in. Use this attribute instead of specifying the full class name (namespace.className) on each of your types.
<xs:elementname="ESRI.Configuration"xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:annotation><xs:documentation>ESRI Plug-In</xs:documentation></xs:annotation><xs:complexType><xs:all><xs:elementname="Name"type="ST_String"minOccurs="1"><xs:annotation><xs:documentation>
The add-in's name.
</xs:documentation></xs:annotation></xs:element><xs:elementname="AddInID"type="ST_String"minOccurs="1"><xs:annotation><xs:documentation>
A uniquie identifier for the add-in, usually a GUID.
</xs:documentation></xs:annotation></xs:element><xs:elementname="Description"type="ST_String"><xs:annotation><xs:documentation>
A detailed description of the add-in.
</xs:documentation></xs:annotation></xs:element><xs:elementname="Version"type="ST_String"minOccurs="1"><xs:annotation><xs:documentation>
The version of the add-in.
</xs:documentation></xs:annotation></xs:element><xs:elementname="Image"type="ST_String"minOccurs="0"><xs:annotation><xs:documentation>
The image to associate with the entire add-in.
</xs:documentation></xs:annotation></xs:element><xs:elementname="Author"type="ST_String"><xs:annotation><xs:documentation>
The author of the add-in.
</xs:documentation></xs:annotation></xs:element><xs:elementname="Company"type="ST_String"><xs:annotation><xs:documentation>
The company that developed the add-in.
</xs:documentation></xs:annotation></xs:element><xs:elementname="Date"type="ST_String"><xs:annotation><xs:documentation>
The date the add-in was created.
</xs:documentation></xs:annotation></xs:element><xs:elementname="Targets"minOccurs="1"><xs:annotation><xs:documentation>
The ArcGIS product and version the add-in targets.
</xs:documentation></xs:annotation><xs:complexType><xs:choiceminOccurs="0"maxOccurs="unbounded"><xs:elementname="Target"><xs:complexType><xs:attributename="name"type="ST_Product"use="required"/><xs:attributename="version"type="ST_String"use="required"><xs:annotation><xs:documentation>
A version of the ArcGIS product; for example, '2.3'.
</xs:documentation></xs:annotation></xs:attribute></xs:complexType></xs:element></xs:choice></xs:complexType></xs:element><xs:elementname="AddIn"type="CT_AddIn"minOccurs="1"/></xs:all></xs:complexType></xs:element>