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A SNOMED CT Template template is a SNOMED CT expression, expression constraint, or query that contains one or more slots, which provide a placeholder in an expression, expression constraint or query, whose specific value can . Each template slot either provides information as to how the template should be processed (i.e. an information slot), or serves as a placeholder for a specific value that may be completed at a subsequent time. Each replacement slot may have a replacement type (e.g. concept, expression, token, string, integer or decimal), a slot name, and a replacement constraint. Depending on the replacement type, the replacement constraint may either be an expression constraint, a value list constraint or a range constraint. Each information slot may have a cardinality and a slot name.

The SNOMED CT Template Syntax therefore template syntax defines the syntax used for these slots, and how the slot syntax is to be incorporated into the other languages.

Each template slot contains either …   <To be completed>

Figure 1 below illustrates the overall structure of a template slotirrespective of the computable language in which they are embedded.  below illustrates the abstract model of the SNOMED CT template syntax. Please note that no specific semantics should be attributed to each arrow in this abstract diagram.

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