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Product Version = NetBeans IDE 6.9.1 (Build 201011082200) Operating System = Windows 7 version 6.1 running on amd64 Java; VM; Vendor = 1.6.0_22 Runtime = Java HotSpot(TM) 64-Bit Server VM 17.1-b03 netbeans editor consider this to be an error, although it isn't: <ui:fragment rendered="true"> fragment is rendered </ui:fragment> the 'rendered="true"' part is red underlined although this is correct JSF. So my guess is that there's something missing in the definition for the JSF facelets syntax in netbeans, wherever that is.
according to Mojarra's 2.0.3 FCS ui.taglib.xml there are just id and binding attributes for the fragment tag. Wich may be the mojarra's descriptor bug.
*** This bug has been marked as a duplicate of bug 202925 ***