Where is the Apple Developer Doc Master Data Starting Point?

Question

In the Apple Master Data Programming Guide , they have the following note:

Important: Although this document provides a solid foundation for basic information, simply reading from beginning to end is not a good strategy to learn how to use this technology effectively. Instead, you should usually increase your understanding by following the appropriate tutorials in the reference library. For a description of the recommended learning path, see Starting Point of Source Data.

If you go to the bottom of the page, the See Also section lists "Starting Point of Source Data", but there is no link to the document. Where is the document located?

Answer 1

Based on a comment by Rob Bajorek ,

This is a "retired" document. Here you are: Starting point of source data

As for why he retired, from the same page:

Attention!

This document may not represent best practices for ongoing development. Download links and other resources may be invalidated.