Daniel Veillard's libxml
(ftp://ftp.gnome.org/pub/GNOME/sources/libxml/)
and/or
Jim Clark's expat (http://www.jclark.com/xml)

Parsing facilities for both XML files and DTDs, offering both
event and tree based parsers and customizable with R functions.
Daniel Veillard's libxml
(ftp://ftp.gnome.org/pub/GNOME/stable/sources/libxml/)
and/or
Jim Clark's expat (http://www.jclark.com/xml)
This is released by the Omegahat Project for Statistical
Computing. Bug reports should be submitted via
http://www.omegahat.org/bugs

Tools for parsing and generating XML within R and S-Plus.

Parsing facilities for arbitrary XML files, DTDs and HTML, offering both
event and tree based parsers which are customizable with R functions.

This package provides many approaches for both reading and creating XML (and HTML)
documents (including DTDs), both local and accessible via HTTP or FTP.  It also offers
access to an XPath "interpreter".
The versions numbers 1.0 and 2.0 do not have any special significance, but are merely
the result of incrementing the minor count by 1 for each release.
Specifically, there is no change in the interface.
AAA.R
DTD.R
DTDClasses.R
DTDRef.R
SAXMethods.S
XMLClasses.R
applyDOM.R
assignChild.R
catalog.R
createNode.R
dynSupports.R
error.R
flatTree.R
hashTree.R
htmlParse.R
nodeAccessors.R
parseDTD.R
schema.S
summary.R
tangle.R
toString.S
tree.R
version.R
xmlErrorEnums.R
xmlEventHandler.R
xmlEventParse.R
xmlHandler.R
xmlInternalSource.R
xmlNodes.R
xmlOutputBuffer.R
xmlOutputDOM.R
xmlTree.R
xmlTreeParse.R
zzz.R
supports.R

This package provides many approaches for both reading and
creating XML (and HTML) documents (including DTDs), both local
and accessible via HTTP or FTP.  It also offers access to an
XPath "interpreter".
The versions numbers 1.0 and 2.0 do not have any special
significance, but are merely the result of incrementing the
minor count by 1 for each release. Specifically, there is no
change in the interface.
AAA.R DTD.R DTDClasses.R DTDRef.R SAXMethods.S XMLClasses.R
applyDOM.R assignChild.R catalog.R createNode.R dynSupports.R
error.R flatTree.R hashTree.R htmlParse.R nodeAccessors.R
parseDTD.R schema.S summary.R tangle.R toString.S tree.R
version.R xmlErrorEnums.R xmlEventHandler.R xmlEventParse.R
xmlHandler.R xmlInternalSource.R xmlNodes.R xmlOutputBuffer.R
xmlOutputDOM.R xmlTree.R xmlTreeParse.R zzz.R supports.R
parser.R libxmlFeatures.R xmlString.R saveXML.R namespaces.R
readHTMLTable.R