1. A non-transitory machine-readable medium storing one or more instructions for generating a labeled transition system for use with model checking of source code in a computer, which when executed by a processor of the computer, cause the processor to perform operations comprising: generating a transition system from the source code; generating an extensible markup language (XML) representation of the source code comprised of nodes, each node having an identifier; generating labels for the transition system to form the labeled transition system by running a query on the XML representation of the source code using query language to return an identifier of a node that matches the query and labeling a node in the transition system identified by the same identifier as the node that matched the query; and using the labels and the structure of the labeled transition system as input to model checking techniques to analyze the source code.