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### Expression chains

An expression chain is a list of expressions separated by ' `|`' characters.

While evaluating expressions separated by ' `|`', PHPTAL will stop its evaluation when an expression value is not null and no error was raised while evaluating the expression.

As a `string:` expression is always true, `string:` always terminates an expression chain whatever expression may follow.

You can use `php:` expressions inside expression chains, like any other expression.

                <h1 tal:content="page/title | page/alternativeTitle | php:get_default_title()" />

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