libxmlVersion function

Query the version and available features of the libxml library.

libxmlVersion retrieves the version of the libxml library used when installing this XML package. libxmlFeatures returns a named logical vector indicating which features are enabled.

libxmlVersion(runTime = FALSE)
libxmlFeatures()

Arguments

• runTime: a logical value indicating whether to retrieve the version information describing libxml when the R package was compiled or the run-time version. These may be different if a) a new version of libxml2 is installed after the package is installed, b) if the package was installed as a binary package built on a different machine.

Returns

libxmlVersion returns a named list with fields - major: the major version number, either 1 or 2 indicating the old or new-style library.

• minor: the within version release number.

• patch: the within minor release version number

libxmlFeatures returns a logical vector with names given by: [1] "THREAD" "TREE" "OUTPUT" "PUSH" "READER" [6] "PATTERN" "WRITER""SAX1" "FTP" "HTTP" [11] "VALID" "HTML" "LEGACY" "C14N" "CATALOG" [16]"XPATH" "XPTR" "XINCLUDE" "ICONV" "ISO8859X" [21] "UNICODE" "REGEXP""AUTOMATA" "EXPR" "SCHEMAS" [26] "SCHEMATRON" "MODULES" "DEBUG""DEBUG_MEM" "DEBUG_RUN" [31] "ZLIB"

Elements are either TRUE or FALSE indicating whether support was activatd for that feature, or NA if that feature is not part of the particular version of libcurl.

References

https://www.w3.org/XML/, http://www.xmlsoft.org, https://www.omegahat.net

Author(s)

Duncan Temple Lang

Examples

ver <- libxmlVersion()
 if(is.null(ver)) {
   cat("Relly old version of libxml\n")
 } else {
   if(ver$major > 1) {
     cat("Using libxml2\n")
   }
 }