Web Resource Visualization - Underlying Data

Hello everyone,

I'm trying to create a Web Resource Visualization (WRV) using a HTML page.

When I create the visualization xml I can successfully add a "string" as a datadescription.

eg.: <datadescription>Pedro</datadescription>

Instead of using a string in WRV, can I use a "fetchXml" like in Chart Visualizations? Is there any other way to get context date from the list of entities the user is seeing? 

When I use a XML similar to those in charts, it simply doesn't import.

I can get the viewid from the querystring of the resource and get to the contacts that way, but Is there a better approach? (that will also filter date when I filter a column)

Thanks alot in advance,

Pedro