R: Query the version and available features of the libxml...

libxmlVersion {XML} | R Documentation

## Query the version and available features of the libxml library.

### Description

`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.

### Usage

    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.

### Value

`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.

### Author(s)

Duncan Temple Lang

### References

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

### Examples

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

[Package XML version 3.99-0.3 Index]