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=== Placeholder identifiers ===
Placeholders are usually indicated by some special character or sequence of characters to distinguish them from the rest of the snippet text. Some systems allow snippet placeholders to be named [[identifier]]s. The identifiers may be useful for supporting such features as placeholder duplication or placeholder transformation.

The following example uses the identifiers <code>first_name</code>, <code>last_name</code>, and <code>item</code>:

<pre>
Hello {%first_name%} {%last_name%},

Your shipment of {%item%} is now ready to pick up.

Thanks {%first_name%}!
</pre>