Golang : Adding XML attributes to xml data or use attribute to differentiate a common tag name
Problem :
There are times when we want to produce XML files that are easier to read by human eyes and you happen to have a Golang program that produce XML data that look like this :
<person>
<id>13</id>
<name>
<first>John</first>
<last>Doe</last>
</name>
<age>42</age>
<Married>false</Married>
<City>Hanga Roa</City>
<State>Easter Island</State>
<!-- Need more details. -->
</person>
To make it more readable, you want to make the field ID as a XML attribute of the Person instead of separate tag. Or you want to make the XML data to become more readable such as :
<HostProperties>
<tag name="HOST_END">Thu Feb 20 12:38:24 2014</tag>
<tag name="patch-summary-total-cves">4</tag>
<tag name="host-fqdn">foobar.com</tag>
<tag name="HOST_START">Thu Feb 20 12:30:14 2014</tag>
</HostProperties>
with the XML attribute name
to differentiate each tags
How to do that ?
Solution :
Add the attr
tag into Person structure. For example :
type Person struct {
XMLName xml.Name `xml:"person"`
Id int `xml:"id,attr"` //<--- add attr and see what will happen
FirstName string `xml:"name>first"`
LastName string `xml:"name>last"`
Age int `xml:"age"`
Height float32 `xml:"height,omitempty"`
Married bool
Address
Comment string `xml:",comment"`
}
the output will become :
<person id="13">
<name>
<first>John</first>
<last>Doe</last>
</name>
<age>42</age>
<Married>false</Married>
<City>Hanga Roa</City>
<State>Easter Island</State>
<!-- Need more details. -->
</person>
The complete code :
package main
import (
"encoding/xml"
"fmt"
)
type Address struct {
City, State string
}
type Person struct {
XMLName xml.Name `xml:"person"`
Id int `xml:"id,attr"` //<--- remove attr and see what will happen
FirstName string `xml:"name>first"`
LastName string `xml:"name>last"`
Age int `xml:"age"`
Height float32 `xml:"height,omitempty"`
Married bool
Address
Comment string `xml:",comment"`
}
func main() {
v := &Person{Id: 13, FirstName: "John", LastName: "Doe", Age: 42}
v.Comment = " Need more details. "
v.Address = Address{"Hanga Roa", "Easter Island"}
output, err := xml.MarshalIndent(v, " ", " ")
if err != nil {
fmt.Printf("error: %v\n", err)
}
fmt.Println(string(output))
}
Play at : http://play.golang.org/p/mioNj3kht-
By Adam Ng
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