[Rd] Missing links on Windows and \link[bar]{foo}; clarification

[Gavin Simpson]

Dear List,

In one of my packages on R-Forge I have a custom panel function for
Lattice graphics. In the Rd file for this panel function I want to
provide links to some lattice functions (in package lattice). My first
instinct was to use:

\code{\link[lattice]{panel.xyplot}}

for example. However, I missed a few references to lattice functions and
just marked them up as \code{\link{panel.xyplot}}.

For the latter, I am getting warnings about missing links during package
check and installation *only* on Windows and *only* on R patched
(R-Forge version: R version 2.8.1 Patched (2009-01-12 r47554)).

With R Devel (R-Forge version: 2.9.0 Under development (unstable)
(2009-01-10 r47538)) under Windows no warnings are issued.

The R-exts manual mentions that the first style is rarely needed, yet
the warnings on R-patched suggest that [currently] it is, for CHM help
only, which is where I presume the warnings are being generated.

Is the change in R Devel intentional or a side-effect of other changes
that is yet to be fixed? (I appreciate that this version of R is still
under development and unstable.) Is this difference between versions
related to (from NEWS)?:

o	HTML links will be resolved first to the standard packages: this
	avoids other installed packages diverting help on e.g. qr()
	and plot() to themselves.

So can I proceed under the assumption that \code{\link{panel.xyplot}} is
the correct methodology for linking to a functions in
another /recommended/ package?

Is this different when referring to a function in another,
non-recommended package (i.e. that \code{\link{panel.xyplot}} is
preferred in most situations)?

Thanks in advance,

Gavin
-- 
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