Running example

Write the following XSLT stylesheets for the DBLP application and run them:

1. a stylesheet to transform a DBLP XML document into an XHTML document;
2. a stylesheet to transform a DBLP XML document into a BibTeX document.
3. a stylesheet to transform a DBLP XML document into a GraphML document that contains the collaboration graph for the bibliography. The collaboration graph is an undirected graph in which nodes represent authors and edges represent co-authorships in papers.