无法为签名'"character"'找到函数'saveXML'的继承方法

Question

在尝试解析xml文件时,我总是遇到此错误.

一个简单的脚本来重现它:

doc <- xmlRoot(xmlTreeParse("http://www.stat.purdue.edu/~mdw/490M/cdcatalog.xml"))

xpathSApply(doc, "//CATALOG/CD/PRICE", xmlValue)

Error in (function (classes, fdef, mtable)  : 
 unable to find an inherited method for function ‘saveXML’ for signature ‘"character"’

加载以下包:

sessionInfo()
 R version 3.1.0 (2014-04-10)
 Platform: x86_64-apple-darwin13.1.0 (64-bit)

 locale:
 [1] de_DE.UTF-8/de_DE.UTF-8/de_DE.UTF-8/C/de_DE.UTF-8/de_DE.UTF-8

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

 other attached packages:
 [1] XML_3.98-1.1

 loaded via a namespace (and not attached):
 [1] tools_3.1.0

Answer 1

url <- "http://www.stat.purdue.edu/~mdw/490M/cdcatalog.xml"    
doc <- xmlRoot(xmlTreeParse(url, useInternalNodes = TRUE))
xpathSApply(doc, "//CATALOG/CD/PRICE", xmlValue)

我认为这与名称空间的解析有关.xpath使用getNodeSet()需要useInternalNodes = TRUE

Answer 2

doc <- xmlParse("http://www.stat.purdue.edu/~mdw/490M/cdcatalog.xml")

应该做...