# Expression Template Examples

In this chapter, we present a variety of examples to illustrate how the template syntax defined in Syntax Specification can be used to represent *expression templates*. A *SNOMED CT expression template* is a SNOMED CT expression, which contains one or more template slots. As defined in Syntax Specification, all template slots are represented using a pair of double square brackets - i.e. \[\[ ]].

There are two main types of template slots:

1. *Replacement Slots* , which are replaced by a concept, expression or string during template processing, and
2. *Information Slots* , which are purely there to provide metadata about how the template is to be processed.

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