XML package example code?
It's been a long time since i read the tutorials, but 'I think', the
reason you get those notifications is because the html code is
malformed, meaning that some of the opening tags '<dd>' don't have
corresponding end tags </dd> etc.
The XML package seems rather good at working with malformed code, and
therefore I usually just force those notifications into an empty
function.
library(RCurl)
library(XML)
html <- getURL("http://www.omegahat.org/RSXML/index.html")
html.tree <- htmlTreeParse(html, useInternalNodes = TRUE, error =
function(...){})
HTH,
Tony Breyal
On 25 Nov, 16:21, Peng Yu <pengyu... at gmail.com> wrote:
On Wed, Nov 25, 2009 at 12:19 AM, cls59 <ch... at sharpsteen.net> wrote:
Peng Yu wrote:
I'm interested in parsing an html page. I should use XML, right? Could you somebody show me some example code? Is there a tutorial for this package?
Did you try looking through the help pages for the XML package or browsing the Omegahat website?
Look at:
?library(XML) ??htmlTreeParse
And the relevant web page for documentation and examples is:
http://www.omegahat.org/RSXML/shortIntro.html I'm trying the example on the above webpage. But I'm not sure why I got the following error. Would you help to take a look? $ Rscript main.R> library(XML)
download.file('http://www.omegahat.org/RSXML/index.html','index.html')
trying URL 'http://www.omegahat.org/RSXML/index.html' Content type 'text/html; charset=ISO-8859-1' length 3021 bytes opened URL ================================================== downloaded 3021 bytes
doc = xmlInternalTreeParse("index.html")
Opening and ending tag mismatch: dd line 68 and dl Opening and ending tag mismatch: li line 67 and body Opening and ending tag mismatch: dt line 66 and html Premature end of data in tag dd line 64 Premature end of data in tag li line 63 Premature end of data in tag dt line 62 Premature end of data in tag dl line 61 Premature end of data in tag body line 5 Premature end of data in tag html line 1 Error: 1: Opening and ending tag mismatch: dd line 68 and dl 2: Opening and ending tag mismatch: li line 67 and body 3: Opening and ending tag mismatch: dt line 66 and html 4: Premature end of data in tag dd line 64 5: Premature end of data in tag li line 63 6: Premature end of data in tag dt line 62 7: Premature end of data in tag dl line 61 8: Premature end of data in tag body line 5 9: Premature end of data in tag html line 1 Execution halted
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