XML elements to list XML objects

Question

How could I split the XML tree to a list of XML objects and then I like to user the function getNodeSet but the return value should include the root object "part"?

require(XML)

txt = "<doc>
         <part>
           <name>ABC</name>
           <type>XYZ</type>
           <cost>3.54</cost>
           <status>available</status>
         </part>
         <part>
           <name>ABC</name>
           <type>XYZ</type>
           <cost>3.54</cost>
           <status>available</status>
         </part>
       </doc>"

doc <- xmlTreeParse(txt, useInternalNodes = TRUE)
special_nodes <- getNodeSet(doc, "/*/part//*")

For the first question I found xpathApply(doc, "//doc/*") but this is not exactly what I am looking for because I dont want to specify the root doc. I want that it founds the tags part under each root. — Klaus
– Klaus, Commented Aug 28, 2013 at 15:13

Martin Morgan · Accepted Answer · 2013-08-28 15:13:11Z

1

I think the nodes returned by getNodeSet are pointers into the underlying XML object, so for instance

> special_nodes[[1]]
<name>ABC</name> 
> xpathSApply(special_nodes[[1]], "../cost")
[[1]]
<cost>3.54</cost>

answered Aug 28, 2013 at 15:13

Martin Morgan

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3 Comments

Klaus Over a year ago

I am not sure if I get you, but hasSentence = xpathApply(doc, "../part") gives me not a list of xml objects where each entry is a xml tree of the form

<part>            <name>ABC</name>            <type>XYZ</type>            <cost>3.54</cost>            <status>available</status>          </part>

Martin Morgan Over a year ago

But xpathSApply(special_nodes[[1]], "../../part") does? Actually I'm not following why 'doc' appears in relation to my answer, which operates on special_nodes[[1]]; maybe you found the answer to your original question in some other way.

Klaus Over a year ago

know my second problem is still alive, it depends on the question how to transform the result of l<-getNodeSet(doc, "//part") for each entry in l to a list of nodes. Taht means I want all nodes for i>0 in l[i] in a list where each entry is a node.

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