request time expressions and constant values are the two types of attributes which can be used for using request time attributes rtexprvalue under attribute tag should be set to true.The value can be specified at request time in that case like <%= request.getParameter("name1")%>
When you are using attributes in your custom tag then there are two possible ways by which you can use attributes.
a) In your TLD file you mention : <attribute> <name>num</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute>
b) And for attributes which you want to mention dynamically(for example the names of attributes you are not sure)then go ahead and make this declaration:
<dynamic-attributes>true</dynamic-attributes> Then you have to implement the DynamicAttributes interface in you tag handler class.And also implement the method setDynamicAttribute(String uri,String localName,Object value)
There is a very good article for dynamic-attributes in SCWCD faq or JSP faq not sure.check it out for more clarity.
Best Regards, Pallavi
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