Unit 1 Section 10: Processing in Hierarchical Sequence

This video describes how hierarchical sequencing works, specifically:

• Top to bottom: working down the hierarchy of segment types

• Front to back: going through twin chains

• Left to right: moving to a different segment type at the same level of the hierarchy and a child of the same parent

• Up and to the right: moving to a different segment type higher up in the hierarchy

This video also describes where and how segments are stored in IMS databases.