(Because I find myself referring to many articles in a TiddlyWiki instance.)
Transclusion goodness:
{{Primitive_data_type||tWm}}
So passing the (Wikipedia, mobile) article part of the URL to the tiddler template "tWm".
There is no tiddler named "Primitive_data_type". This is just a way to give "tWm" some text.
The "tWm" tiddler text:
Same kind of thing could be done with a macro if you prefer macros.