Can a task ItemGroup glob files? - msbuild

Question

I have an ItemGroup declared as follows:
<ItemGroup>
<MyCustomProjectType Include="..\path_to_my_project">
<Name>MyProjectName</Name>
</MyCustomProjectType>
</ItemGroup>
This is a custom project type that I want to perform some specific manipulations on.
Later I have a Target (example only but it communicates what I am after):
<Target Name="MyTarget">
<ItemGroup>
<CustomProjectReferenceFiles
KeepMetadata="Name"
Include="#(MyCustomProjectType->'%(Identity)\%(Name)\**\*')"
Exclude="**\*.x;**\*.y"
/>
</ItemGroup>
<Message Text="#(CustomProjectReferenceFiles)" />
</Target>
So I have a Target based ItemGroup where I am attempting, using a transform, to create a new Include. This does run, but it appears the Include is literally set to:
..\path_to_my_project\MyProjectName\**\*
AKA that glob/wildcards are not expanded.
I'm pretty new to MSBuild so maybe I am missing something in my search of the documentation. One solution I thought of here would be just just create a new Custom Task that handles pulling out the files I need and setting that Output on an intermediate Target.
I also found this SO question:
https://stackoverflow.com/a/3398872/1060314
Which brings up the point about CreateItem being deprecated which leaves me with not knowing what the alternatives are.

Answer 1

The easiest way is to use an intermediate property so that the actual text is used and not the escaped transformed items:
<PropertyGroup>
<_CustomProjectReferenceFileIncludes>#(MyCustomProjectType->'%(Identity)\%(Name)\**\*')</_CustomProjectReferenceFileIncludes>
</PropertyGroup>
<ItemGroup>
<CustomProjectReferenceFiles
KeepMetadata="Name"
Include="$(_CustomProjectReferenceFileIncludes)"
Exclude="**\*.x;**\*.y"
/>
</ItemGroup>