I want to give each list of posters that gets generated a unique rel tag. So the first list of posters will have something like rel="movie-1" and then the second list of posters has rel="movie-2" like this code. Is there a way to give a DataObjectManager a Title or something?

<ul>
  <li><a rel="set-1">item 1</a></li>
  <li><a rel="set-1">item 2</a></li>
</u>

<ul>
  <li><a rel="set-2">item 2</a></li>
  <li><a rel="set-2">Item 4</a></li>
</ul>

<% control Children(4) %>
	<h3><a href="$Link">$Title</a></h3>
	<h4>Sypnosis</h4>
	<p>$Content</p>
	
	<h4>Posters</h4>
	<% if Posters %>
		<ul class="posters clear">
			<% control Posters %>
				<li>
					<a href="<% control PosterImage %>$URL<% end_control %>" title="$PosterName" rel=""><% control PosterImage %><% control CroppedImage(125,188) %><img src="$URL" alt="$PosterName" /><% end_control %><% end_control %><span></span></a>
				</li>
			<% end_control %>
		</ul>
	<% else %>
		<h5>No Posters Yet</h5>
		<p>Do you have a poster for this movie? Please <a href="contact">send it to us</a> so we can add it to the site.</p>
	<% end_if %>
<% end_control %>

There are a number of ways to do it.

rel="movie-$Pos" will give you the number of the record's position. Starts with 1.

Or, since you know the ID is guaranteed unique, you can always do

rel="movie-$ID"

That would generate something like this.

<ul>
  <li><a rel="movie-1">item-1</a></li>
  <li><a rel="movie-2">item-2</a></li>
  <li><a rel="movie-3">item-3</a></li>
</ul>

<ul>
  <li><a rel="movie-1">item-1</a></li>
  <li><a rel="movie-2">item-2</a></li>
  <li><a rel="movie-3">item-3</a></li>
</ul>

I want to generate something like this.

<ul>
  <li><a rel="movie-1">item-1</a></li>
  <li><a rel="movie-1">item-2</a></li>
  <li><a rel="movie-1">item-3</a></li>
</ul>

<ul>
  <li><a rel="movie-2">item-1</a></li>
  <li><a rel="movie-2">item-2</a></li>
  <li><a rel="movie-2">item-3</a></li>
</ul>

What about rel="movie-$ParentID"?

Just tried it. It doesn't generate anything just rel="movie-"

Well, you get the idea, though. It's just the foreign key that ties the object to the parent. So whatever your has_one relationship is from Poster to its containing page, use that, e.g. $PosterHolderID, or whatever you're using.