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Eclipse is an epic failure with regard to JSP/EL validation. Just ignore it or disable all (or parts of) JSP/EL validation in workspace preferences through Validation and/or Web > JSP Files > Validation.
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http://stackoverflow.com/questions/2268153/somevariable-cannot-be-resolved-error-indicated-in-eclipse-for-an-included-jspgood pratice in php
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http://www.phptherightway.com/#site-header