InfoPath Dev

I have an InfoPath form which connected to SharePoint to create an external content type. I want to be able to query my SharePoint List/Library. I know I can use the queryFields to set certain fields equals to a certain value, but is there a way to apply custom queries to secondary data sources which are connected to SharePoint Lists/Libraries? I need to be able to implement more advanced conditions such as if a field contains a certain value or if something is greater than something else.

I came across this article (http://support.microsoft.com/kb/826992) about using wildcard characters when quering SQL or Access Databases but I havent been able to able this to my situation yet.

Thank you, in advance.

EDIT: The reason why i need this custom query is because I need to apply multiple criterias (1. location, 2. datetime, 3. screens). Screens is contained in a repeating field, but I havent been able to figure out how to apply a filter on it yet.

Here's a recent discussion that might help: http://www.infopathdev.com/forums/t/19200.aspx

Thanks. This is going to give me more flexibility. But can you have multiple filters in a REST URI?