Some frames are complex in that they refer to sequences of states and transitions, each of which can itself be separately described as a frame. The separate frames (called subframes) are related to the complex frames via the SubFrame relation. In such cases, frame elements of the complex frame may be identified (mapped) to the frame elements of the subparts, although not all frame elements of one need have any relation to the other. (In this respect, it contrasts with inheritance; see below.) Also, the ordering and other temporal relationships of the subframes can be specified using binary precedence relations. To illustrate, consider the complex Criminal process frame. A Suspect is arrested by an Authority on certain Charges, then is arraigned as a Defendant. If at any time the Defendant pleads guilty, then the Defendant is sentenced, otherwise the Defendant first goes to trial. If the Finding after the trial is guilty, then the Defendant is sentenced. In the end, the Defendant is either released or is given a Sentence by a Judge at the sentencing. For each step in the process, there is a separate frame in the database, including Arrest, Arraignment, Trial, Sentencing, and so on. Each of these frames is related to the Criminal process frame via the SubFrame relation in the database. Moreover, subframes (of the same complex frame) are related to each other through their ordering. (See Narayanan et al. (2002) and Scheffczyk et al. (2006).) Note that the FEs of the subframes need not map to those of other subframes. So, in this same group of frames, the Arrest frame includes an Arresting authority which is not included in the Trial frame. Notice that a given subframe may itself be a complex frame. For example, the Trial frame is a subframe of the Criminal process frame, and has its own rich structure, some of which can be decomposed into simpler frames that are related to each other. A Trial is made up of court appearances, and involves opening arguments, presentation of evidence and testimony, and closing arguments. The system of subframe links is also quite complex. At present, the subframe relation is not indicated in every relevant case. xsd:string