Generating Custom Tab

It covers object tabs, web tabs, and Visualforce tabs, with strict guidance on which XML elements are actually allowed (spoiler: way fewer than you'd think). The spec is heavy on "don't add this element" warnings because the metadata API will reject common mistakes like putting a label on an object tab or including forbidden elements like `<sobjectName>`. Useful if you're setting up navigation for custom objects or embedding external content and tired of guessing why your tabs won't deploy. The motif selection guidance is a nice touch, it pushes you to pick contextually relevant icons instead of lazily reusing the same one.