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I'm trying to update to the Summer `19 (v46.0) Tooling API WSDL in a .NET project.
When I attempt to update the service reference from the v45.0 WSDL I get the following error from MSDiscoCodeGenerator:

Attempting the same conversion from the command line gives:

wsdl.exe tooling_46_0_scratch.wsdl

Error: Unable to import binding 'SforceServiceBinding' from namespace 'urn:tooling.soap.sforce.com'.

- Unable to import operation 'create'.

- The datatype 'urn:metadata.tooling.soap.sforce.com:AnalyticsSettings' is missing.

How can I import this Tooling API WSDL into a .NET project?

Looking into the v46.0 Tooling API WSDL at the complexType AnalyticsSettings (which is new in v46.0):

 <xsd:complexType name="AnalyticsSettings">
 <xsd:complexContent>
 <xsd:extension base="ens:sObject">
 <xsd:sequence>
 <xsd:element name="DurableId" minOccurs="0" type="xsd:string" nillable="true"/>
 <xsd:element name="FullName" minOccurs="0" type="xsd:string" nillable="true"/>
 <xsd:element name="IsInsightsEnabled" minOccurs="0" type="xsd:boolean" nillable="true"/>
 <xsd:element name="IsPowerInsightsEnabled" minOccurs="0" type="xsd:boolean" nillable="true"/>
 <xsd:element name="IsSmartDataDiscoveryEnabled" minOccurs="0" type="xsd:boolean" nillable="true"/>
 <xsd:element name="IsWaveReplicationEnabled" minOccurs="0" type="xsd:boolean" nillable="true"/>
 <xsd:element name="IsWaveSharingInheritanceEnabled" minOccurs="0" type="xsd:boolean" nillable="true"/>
 <xsd:element name="IsWaveTemplateEnabled" minOccurs="0" type="xsd:boolean" nillable="true"/>
 <xsd:element name="Metadata" minOccurs="0" type="mns:AnalyticsSettings" nillable="true"/>
 </xsd:sequence>
 </xsd:extension>
 </xsd:complexContent>
 </xsd:complexType>

This is defined in the schema for the "urn:sobject.tooling.soap.sforce.com" namespace. The element "Metadata" with the type "mns:AnalyticsSettings" is in the "urn:metadata.tooling.soap.sforce.com" namespace.

The schema for the urn:metadata.tooling.soap.sforce.com namespace doesn't have a definition for the complexType AnalyticsSettings.

I added a stub for the missing complex type in the urn:metadata.tooling.soap.sforce.com namespace schema.

 <xsd:complexType name="AnalyticsSettings">
 <xsd:complexContent>
 <xsd:extension base="mns:MetadataForSettings">
 <xsd:sequence>

 </xsd:sequence>
 </xsd:extension>
 </xsd:complexContent>
 </xsd:complexType>

After that I got a similar error for another type:

The datatype 'urn:metadata.tooling.soap.sforce.com:UserManagementSettings' is missing.

So I added that as well:

 <xsd:complexType name="UserManagementSettings">
 <xsd:complexContent>
 <xsd:extension base="mns:MetadataForSettings">
 <xsd:sequence>

 </xsd:sequence>
 </xsd:extension>
 </xsd:complexContent>
 </xsd:complexType>

After adding those I've been able to generate the integration code from the WSDL.
There would likely be further issues if you tried to use the metadata fields on either of these sObjects.

I've raised support case # 23301433 about getting the WSDL fixed properly.