How to parse xml with namespace using gokogiri (libxml2)?
I am using github.com/moovweb/gokogiri
to parse an XML document. The parsing var b
does the following: but when I try to do the same on var a
(which has a namespace), I get no output. How do I process XML that has a namespace using gokogiri
?
package main
import (
"github.com/moovweb/gokogiri"
"github.com/moovweb/gokogiri/xpath"
"log"
)
func main() {
log.SetFlags(log.Lshortfile)
doc, _ := gokogiri.ParseXml([]byte(a))
defer doc.Free()
doc.SetNamespace("", "http://example.com/this")
x := xpath.Compile(".//NodeA/NodeB")
groups, err := doc.Search(x)
if err != nil {
log.Println(err)
}
for i, group := range groups {
log.Println(i, group)
}
}
var a = `<?xml version="1.0" ?><NodeA xmlns="http://example.com/this"><NodeB>thisthat</NodeB></NodeA>`
var b = `<?xml version="1.0" ?><NodeA><NodeB>thisthat</NodeB></NodeA>`
EDIT # 1: I also tried doc.RegisterNamespace
but got
doc.RegisterNamespace undefined (type * xml.XmlDocument has no RegisterNamespace field or method) "
and x.RegisterNamespace
getting
x.RegisterNamespace undefined (type * xpath.Expression does not have a RegisterNamespace field or method) "
Even though the namespace used in XML has no prefix (i.e. the default), you need to register and use it in your xpath expression.
This prefix can be anything I used here ns
. Note that this may differ from the prefix used in the document (if any) - the important part that must match is the namespace string itself.
Example:
package main
import (
"fmt"
"github.com/moovweb/gokogiri"
"github.com/moovweb/gokogiri/xpath"
)
func main() {
doc, _ := gokogiri.ParseXml([]byte(a))
defer doc.Free()
xp := doc.DocXPathCtx()
xp.RegisterNamespace("ns", "http://example.com/this")
x := xpath.Compile("/ns:NodeA/ns:NodeB")
groups, err := doc.Search(x)
if err != nil {
fmt.Println(err)
}
for i, group := range groups {
fmt.Println(i, group.Content())
}
}
var a = `<?xml version="1.0" ?><NodeA xmlns="http://example.com/this"><NodeB>thisthat</NodeB></NodeA>`
Output:
0 thisthat
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