Group Particles (XSM)

An element composed of other elements is a parent element with child elements.

Child elements are linked to their parent element through a group particle.

There are three kinds of group particles:

Tool	Symbol	Description
		Sequence - Child elements must appear at least once in the order of their declaration
		Choice - Only one child element can be linked to the parent element
		All - Child elements can appear in any order and each of them once or not at all

These particles translate to the following tags in each of the supported languages:

Group Particle	XSD	XDR (order attribute)	DTD (separator)
Sequence	<sequence>	seq	, (comma)
Choice	<choice>	one	\| (bar)
All	<all>	many	, (comma)

Creating a Group Particle
You can create a group particle in any of the following ways:
Group Particle Properties
You can modify an object's properties from its property sheet. To open a group particle property sheet, double-click its diagram symbol or its Browser entry beneath its parent object. The following sections detail the property sheet tabs that contain the properties most commonly entered for group particles.
Adding a Child Object to a Group Particle
XML objects do not support standard link objects. To link a child object to a group particle, you must click the child object tool in the palette and then click the group particle symbol in the diagram. This will automatically create a link between both objects. See the following table for allowed links:

Parent topic: Building XML Diagrams