PhyQL: A Web-Based Phylogenetic Visual Query Engine

Biologists are often interested to query published phylogenetic data for research purposes. PhyQL, a Web-based visual phylogenetic query engine, can be quite useful on this regard. In PhyQL, we have implemented a data model and a visual query language to interact with hierarchically classified tree elements. To hide textual query submission, PhyQL provides a design interface to build the query visually. The users can build simple to complex queries using the query operators. PhyQL separates the application layer from the data layer by a logic layer leading to reduced query tools development time. Moreover,PhyQL provides interactive tree views in radial, phylogram and dendrogram layout. It can be accessed online at http://integra.cs.wayne.edu/softwares/phyql/.