Google app engine datastore "low level api" for Java examples, tutorials, documentation?

Any suggestions on where to find examples, tutorials, and more thorough documentation on how to use the Google App Engine Datastore "Low Level Api" for Java?

I know this basic documentation page exists, but it just tells me whats in the Api and doesn't say much about how to actually use it: http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/d开发者_C百科atastore/package-summary.html

Thanks! Chris

---

Two nice articles I found:

• Introduction to working with App Engine’s low-level datastore API and
• Issuing App Engine datastore queries with the Low-Level API

---

I don't know if this articles fit here, but covers in a very technical way the datastore.

---

There are many pages at: http://code.google.com/appengine/docs/java/datastore/

For example the following pages are all low-level API:

Entities, Queries, Transactions, Metadata Queries, Statistics, Async API

---

Slim3 is supposed to be a thin wrapper around the low level datastore.

Since this is open source, you could either study it for the code or as a wrapper.