Edit C:\Program Files (x86)\Microsoft SQL Server\90\Tools\Binn\VSShell\Xml\Schemas\addinschema.xsd

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema targetNamespace="http://schemas.microsoft.com/AutomationExtensibility" 
           xmlns='http://schemas.microsoft.com/AutomationExtensibility' 
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           attributeFormDefault="unqualified" 
           elementFormDefault="qualified" >

<xs:simpleType name="non-empty-string">
        <xs:restriction base="xs:string">
            <xs:minLength value="1" />
        </xs:restriction>
    </xs:simpleType>

<xs:element name="Extensibility">
        <xs:complexType>
            <xs:sequence>
            <xs:choice maxOccurs="unbounded">
                <xs:element name="HostApplication" minOccurs="0" maxOccurs="unbounded">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:choice maxOccurs="unbounded">
                                <xs:element name="Name" type="xs:string"/>
                                <xs:element name="Version" type="xs:string"/>
                            </xs:choice>
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>

<xs:element name="Addin" minOccurs="0" maxOccurs="unbounded">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:choice maxOccurs="unbounded">
                                <xs:element name="FriendlyName" type="xs:string" minOccurs="0" maxOccurs="1" />
                                <xs:element name="Description" type="xs:string" minOccurs="0" maxOccurs="1" />
                                <xs:element name="AboutBoxDetails" type="xs:string" minOccurs="0" maxOccurs="1" />
                                <xs:element name="AboutIconData" type="xs:string" minOccurs="0" maxOccurs="1" />
                                <xs:element name="Assembly" type="xs:string" minOccurs="1" maxOccurs="1"/>
                                <xs:element name="FullClassName" type="xs:string" minOccurs="1" maxOccurs="1"/>
                                <xs:element name="LoadBehavior" type="xs:integer" minOccurs="0" maxOccurs="1" />
                                <xs:element name="CommandPreload" type="xs:integer" minOccurs="0" maxOccurs="1" /> 
                                <xs:element name="CommandLineSafe" type="xs:integer" minOccurs="0" maxOccurs="1" /> 
                            </xs:choice>
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
                
                <xs:element name="ToolsOptionsPage" minOccurs="0" maxOccurs="1">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="Category" minOccurs="0" maxOccurs="unbounded">
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element name="SubCategory" minOccurs="1" maxOccurs="unbounded">
                                            <xs:complexType>
                                                <xs:sequence>
                                                    <xs:choice maxOccurs="unbounded">
                                                        <xs:element name="Assembly" type="xs:string"/>
                                                        <xs:element name="FullClassName" type="xs:string"/>
                                                    </xs:choice>
                                                </xs:sequence>
                                                <xs:attribute name="Name" type="xs:string" use="required"/>
                                            </xs:complexType>
                                        </xs:element>
                                    </xs:sequence>
                                    <xs:attribute name="Name" type="xs:string" use="required"/>
                                </xs:complexType>
                            </xs:element>
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
                </xs:choice>
            </xs:sequence>
        </xs:complexType>
    </xs:element>

</xs:schema>

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