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
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+12.5k Javascript : Prompt confirmation before exit
+29.7k Golang : Get local IP and MAC address
+15.8k Golang : XML to JSON example
+29.3k Golang : Download file example
+16k Golang : How to make a file read only and set it to writable again?
+7.8k Golang : Handle sub domain with Gin
+7.8k Golang : Capture text return from exec function example
+7.5k Golang : How to find out similarity between two strings with Jaro-Winkler Distance?
+18.2k Golang : Measure http.Get() execution time
+24.5k Golang : Get executable name behind process ID example
+11.7k Golang : Skip blank/empty lines in CSV file and trim whitespaces example
+6.8k Golang Hello World Example