These functions allow us to both access the sibling node to the left or right of a given node and so walk the chain of siblings, and also to insert a new sibling
getSibling(node, after = TRUE, ...) addSibling(node, ..., kids = list(...), after = NA)
the internal XML node (XMLInternalNode) whose siblings are of interest
the XML nodes to add as siblings or children to node.
a list containing the XML nodes to add as siblings.
This is equivalent to ... but used when we already have the
nodes in a list rather than as individual objects. This is used in programmatic
a logical value indicating whether to retrieve or add the
nodes to the right (
returns an object of class
XMLInternalNode (or some derived S3 class, e.g. XMLInternalTextNode)
returns a list whose elements are the newly added
XML (internal) nodes.
# Reading Apple's iTunes files # # Here we read a "censored" "database" of songs from Apple's iTune application # which is stored in a property list. The format is quite generic and # the fields for each song are given in the form # # <key>Artist</key><string>Person's name</string> # # So to find the names of the artists for all the songs, we want to # find all the <key>Artist<key> nodes and then get their next sibling # which has the actual value. # # More information can be found in . # fileName = system.file("exampleData", "iTunes.plist", package = "XML") doc = xmlParse(fileName) nodes = getNodeSet(doc, "//key[text() = 'Artist']") sapply(nodes, function(x) xmlValue(getSibling(x))) f = system.file("exampleData", "simple.xml", package = "XML") tt = as(xmlParse(f), "XMLHashTree") tt e = getSibling(xmlRoot(tt)[]) # and back to the first one again by going backwards along the sibling list. getSibling(e, after = FALSE) # This also works for multiple top-level "root" nodes f = system.file("exampleData", "job.xml", package = "XML") tt = as(xmlParse(f), "XMLHashTree") x = xmlRoot(tt, skip = FALSE) getSibling(x) getSibling(getSibling(x), after = FALSE)
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