how to add the Logical operator in MXML

Misc-Tutorial-48x48 For example , you have something like this:

<mx:VBox visible="{this.numChildren > 555 }" />

The preceding code will not compile,The compiler raises the following error:- “The entity name must immediately follow the ‘>’ in the entity reference.”.This behavior existed since Flex 2.0. Logical OR operator works in the same scenario. It’s the use of ‘&&’ that causes the compiler error.

For greater than, use > and for less than, use <

So it will be

<mx:VBox visible="{this.numChildren &gt; 555 }" />
BTW:You can get more information from here about logical operators in binding MXML
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