Issue with transformation files in a nuget package - nuget

Question

I am creating nuget packages for OSGeo.FDO and I am having the following issue.
FDO uses a providers.xml file that lists all the providers it can use. So I created a main package called OSGeo.FDO containing the following:
<?xml version="1.0" encoding="utf-8" standalone="no"?>
<FeatureProviderRegistry/>
And then, I am creating a nuget package for each provider. In each one of them I include a providers.xml.transform with, for example, the following:
<FeatureProviderRegistry>
<FeatureProvider>
<Name>OSGeo.PostgreSQL.3.6</Name>
<DisplayName>OSGeo FDO Provider for PostgreSQL/PostGIS</DisplayName>
<Description>Read/write access to PostgreSQL/PostGIS-based data store. Supports spatial data types and spatial query operations.</Description>
<IsManaged>False</IsManaged>
<Version>3.6.0.4707</Version>
<FeatureDataObjectsVersion>3.6.0.4707</FeatureDataObjectsVersion>
<LibraryPath>.\PostgreSQLProvider.dll</LibraryPath>
</FeatureProvider>
</FeatureProviderRegistry>
When I install only one provider package, it works as expected, but once I install another one, it just doesn't change the providers.xml file at all. Although it tells me it has been modified and visual studio asks me if I want to reload it. I say I do, but it doesn't add anything to it.
Is there something wrong with what I'm doing?

Answer 1

The NuGet XML transform can be a little quirky. The way you can make this work if the schema allows it is to make each tag unique by adding an attribute. e.g. if you had
<FeatureProviderRegistry>
<FeatureProvider name="OSGeo.PostgreSQL.3.6">
etc...
</FeatureProvider>
</FeatureProviderRegistry>
And then
<FeatureProviderRegistry>
<FeatureProvider name="Other Name">
etc...
</FeatureProvider>
</FeatureProviderRegistry>
Then it should do what you want. I realize that this may not be the way you want your XML schema, but if you can do that, it can be a workaround.