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An Operation Tag allows for basic logic with Flex. For example, looping through categories.

Example:

{% define $x = 1 %}
{% loop category(cat_featured_products, 'name', 'asc') %}
{% if $x == 1 %}
    <tr>
{% endif %}
<td>
<a href="{cat_featured_products.url}">{cat_featured_products.name}</a>
</td>
{% if $x == 2 %}
    </tr>
    {% define $x = 1 %}
{% else %}
    {% increment($x)  %}
{% endif %}
{% endloop cat_featured_products %}

Output:

<tr>
	<td><a href="/clothing/mens">Mens</a></td>
	<td><a href="/clothing/womens">Womens</a></td>
</tr>
<tr>
	<td><a href="/clothing/hats">Hats</a></td>
	<td><a href="/clothing/accessories">Accessories</a></td>
</tr>

From the example above, you can see we are all Operation Tags are enclosed by {% %}