[Portal] Portlet behavior is governed by standards JSR 168, JSR 286 and WSRP, although portal page layout and portal functionality are undefined and vendor-specific [Mashup] Base standards are XML interchanged as REST or Web Services. RSS and Atom are commonly used. More specific mashup standards such as EMML are emerging. [0] 
Relevant standards
C l a s s i f i c a t i o n
P h i l o s o p h y / a p p r o a c h
C o n t e n t d e p e n d e n c i e s
L o c a t i o n d e p e n d e n c i e s
A g g r e g a t i o n s t y l e
E v e n t m o d e l
R e l e v a n t s t a n d a r d s