1. A method to determine a complete parameter of a pulse sequence comprised of multiple sequence modules, for operating a magnetic resonance apparatus, comprising: electronically storing multiple pulse sequences, each as a tree structure comprising a plurality of nodes, in which parameter information of the respective pulse sequence modules of the respective pulse sequence is individually stored, with each node being connected in the tree structure by respective edges to multiple leaves, with a detail of the parameter information of the respective node being stored in each leaf connected thereto; making an entry into a processor that selects a pulse sequence from said memory, as selected pulse sequence for operating the magnetic resonance apparatus and, from the processor, accessing and retrieving the tree structure for the selected pulse sequence; in said processor, executing a tree structure evaluation algorithm for the retrieved tree structure for the selected pulse sequence, in order to determine a complete parameter of the selected pulse sequence as a combination of the parameter information stored in the nodes and leaves of that tree structure; and in the processor, generating an electrical signal representing the complete parameter of the selected pulse sequence, and making the electronic signal available from the processor as an output.