[R] Loading problem with XML_1.9

[Luo Weijun]

Hello Dr. Lang and all,
I posted this message in R-help mail list, but haven’t
solved my problem so far. Therefore, could you help me
look at it?
I have loading problem with XML_1.9 under 64 bit
R2.3.1 for Mac OS X, which I got from
http://R.research.att.com/. XML_1.9 works fine under
32 bit R2.5.0. I thought that could be installation
problem, and I tried install.packages or biocLite,
every time the package installed fine, except some
warning messages below:
ld64 warning: in /usr/lib/libxml2.dylib, file does not
contain requested architecture
ld64 warning: in /usr/lib/libz.dylib, file does not
contain requested architecture
ld64 warning: in /usr/lib/libiconv.dylib, file does
not contain requested architecture
ld64 warning: in /usr/lib/libz.dylib, file does not
contain requested architecture
ld64 warning: in /usr/lib/libxml2.dylib, file does not
contain requested architecture

Here is the error messages I got, when XML is loaded:
> library(XML)
Error in dyn.load(x, as.logical(local),
as.logical(now)) : 
        unable to load shared library
'/usr/local/lib64/R/library/XML/libs/XML.so':
  dlopen(/usr/local/lib64/R/library/XML/libs/XML.so,
6): Symbol not found: _xmlMemDisplay
  Referenced from:
/usr/local/lib64/R/library/XML/libs/XML.so
  Expected in: flat namespace
Error: .onLoad failed in 'loadNamespace' for 'XML'
Error: package/namespace load failed for 'XML'

Session information
> sessionInfo()
Version 2.3.1 Patched (2006-06-27 r38447) 
powerpc64-apple-darwin8.7.0 

attached base packages:
[1] "methods"   "stats"     "graphics"  "grDevices"
"utils"     "datasets" 
[7] "base"     

Prof Brian Ripley also suggested that this could be
that I don’t have a 64-bit version of libxml2
installed. Where I get it and where/how to install it,
if that’s the problem? 
The reason I need to use R64 is that I have memory
limitation issue with R 32 bit version when I load
some very large XML trees (the data file is about
800M). And Martin suggested me to use 'handler'
argument of xmlTreeParse, tried 'handler' with
useInternalNodes=T, but I still got this memory
problem with R 32 bit version. Please tell me what I
can do now. Thank you so much!
Weijun



       
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