Data Transformation Engine Type Designer Reference Guide

Type Designer Reference Guide
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Chapter 7 - Group Properties
This chapter explains group properties. Group properties include the group's
Subclass and Format, which describes how to distinguish one component of that
group from another component of that group.
Group Subclass
Group types have a subclass of Sequence, Choice, or Unordered.
Property Description
Sequence A partially-ordered or sequenced group of data objects. All group
types in Version1.x and higher are converted to the Group
Subclass of Sequence.
Each component of a Sequence group is validated sequentially.
Sequence groups are indicated by the circular
group icon.
Choice Choice groups provide the ability to define a selection from a set
of components like a multiple-choice question on a test. Choice
groups are similar to partitioned sequence groups.
A Choice group is validated as only one of its components.
Validation of a Choice group is attempted in the order of the
components until a single component is validated. If the Choice
group has an initiator, the initiator is validated first.
Choice groups are indicated by the triangular group icon.
Unordered An unordered group has one or more components. Unordered
groups can only have an Implicit format property, with the
same syntax options as sequence groups: None or Delimited.
Unordered groups are indicated by the plus
group icon.
Properties of Group Subclasses
The distinction between Sequence and Choice group subclasses is that Choice
groups have no Partition or Format properties.