iOS RSS Reader

I am starting just now to use Xojo for iOS apps. I would like to create a simple RSS Reader. But excellent Xojo RSS Reader Example/Tutorial found here
Does not work for iOS, and not only because of the different views and controls, but a lot of differences in the framework.
RSS Reader example Desktop
The errors I find are:
“Pair” - can’t find type with this name
“encodings.UTF8” - item does not exist
parameter “content” expects type string, but this is a class xojo.core.memoryblock
“XmlDocument” - can’t find type with this name
“XmlNodeList” - can’t find type with this name
and more…

Can anyone point me to the right direction?
Also, I find very confusing this difference between Xojo Desktop and iOS, is there a table of conversion?