Synchronizing flow objects

• Need to be able to constrain relative placement of flow objects in different streams
• When constructing flow object tree, can specify that flow objects are part of a synchronization set
• Each synchronization set must have synchronizing flow object (typically a column-set-sequence) that contains either directly or indirectly all members of synchronization set
• Can constrain placement of members of a synchronization set so that number of pages/spread/columns between them is between specified limits
• Can constrain members of synchronization set to have same position in column-set area