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The main difference is that the constraints are not strictly part of the meta data for the property . In addition , because the constraints are added to the PropertyDescriptor 's , the constraints are available as meta data from within Java . In this case , both expressions are rvalue expressions . From the viewpoint of these developers , the primary limitation of the JSP EL is that its expressions are evaluated immediately , meaning that the JSP container immediately parses and resolves the expression when it processes the page and returns a response . Any chance I can spend on the water with these guys is a good thing . Immutable here means that the set of constraints are not changed once the Schema object is created . These expressions are now supported by the unified EL , which means that they are not exclusively for use JavaServer Faces applications . The construction of terminals is an important component in creating an up-to-date infrastructure for ever-increasing production and export of the new type of product . Also the constraints are separated from the property definitions which , like deployment descriptors in J2EE , complicates the development process .