Can you please explain what do you want to do?

If you are using AEM 6.0, there are some out of box client validations you can perform on the AEM adaptive forms fields. You might have to write client site validation scripts on dialog fields depending on your requirement.You can do a combination of client side and server side validation, details d...

You can find more information about different options for archetype.http://cqblueprints.com/setup/maven.html

This is a java class, if you have any osgi working class you can use this by importing  com.day.cq.commons.jcr package.API documentation provides more details on the classhttp://docs.adobe.com/docs/en/cq/current/javadoc/com/day/cq/commons/jcr/JcrRecursiveRemove.html

I am able to see the link you posted, it is not broken any more.

Yes, those are administrative overheads for this implementation

Authors have options to lock, unlock and discard on the pages. We have to maintain the versions until there is a need to clean the disk space. If this becomes bottle neck we might have to come with purge workflow to cleanup disk space at regular intervals.

I want the similar functionality that we see on Sidekick version, I think that is done through js.As soon as Author clicks open from siteadmin it will create a new version and lock the page for that author.Author can make the changes to the page and save it, however they have open to rollback all th...

In the siteadmin open page action, I am trying to create a version of the page before opening.How do I create a version using js in SiteAdmin.Actions.js

There is an example of customizing DAM metatadata, it includes a listener athttp://therealcq.blogspot.com/2012/10/customizing-dam-image-metadata.html