Takashi Kato scripsit:

> I meant not for specific implementation but users. If users want to make
> something similar procedures on top the SRFI, then they probably want to
> know if the given object is cursor or index.

Good point.  I will add string-cursor? with specific language saying
that it may return either #t or #f on objects that are neither cursors
nor indexes.

--
John Cowan          http://www.ccil.org/~cowan        xxxxxx@ccil.org
Let's face it: software is crap. Feature-laden and bloated, written under
tremendous time-pressure, often by incapable coders, using dangerous
languages and inadequate tools, trying to connect to heaps of broken or
obsolete protocols, implemented equally insufficiently, running on
unpredictable hardware -- we are all more than used to brokenness.
                   --Felix Winkelmann