It will return a rather large (more than 3.5 MB) Common Schema Definition Language (CSDL) document, or metadata document that describes the data and operations exposed by the service.
This document can be used as a data source to generate classes…
no, only pages, codeunits and queries can be published
Designing Application Objects: msdn.microsoft.com/.../dd301170(v=nav.70).aspx
You use tables to store data. For example, a business application may contain a customer table that stores information about each…
Customizable means that you can add/modify fields/forms/view e.t.c.
Simple to answer. The flag means, that you can customize these entities in your environment.
Customize = Fields, Forms, Name...
Business Applications communities