Go String after variable declaration

Question

Take a look at this snip found at here

import (
    "encoding/xml"
    "fmt"
    "os"
)

func main() {
    type Address struct {
        City, State string
    }
    type Person struct {
        XMLName   xml.Name `xml:"person"`
        Id        int      `xml:"id,attr"`
        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"`
    }

    v := &Person{Id: 13, FirstName: "John", LastName: "Doe", Age: 42}
    v.Comment = " Need more details. "
    v.Address = Address{"Hanga Roa", "Easter Island"}

    enc := xml.NewEncoder(os.Stdout)
    enc.Indent("  ", "    ")
    if err := enc.Encode(v); err != nil {
        fmt.Printf("error: %v\n", err)
    }

}

I can understand in the struct Person, It has a var called Id, which is of type int, but what about the stuff

xml:"person"

after int? What does it mean? Thanks.

fuz · Accepted Answer · 2013-09-08 21:47:02Z

5

It's a struct tag. Libraries use these to annotate struct fields with extra information; in this case, the module encoding/xml uses these struct tags to denote which tags correspond to the struct fields.

answered Sep 8, 2013 at 21:47

fuz

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1 Comment

Roland Illig Over a year ago

See go.dev/ref/spec#Struct_types for the primary source.

Vengatesh Subramaniyan · Accepted Answer · 2018-09-07 07:09:29Z

0

which mean that variable will present in the name of Person example

type sample struct {
     dateofbirth string `xml:"dob"`
}

In the above example, the field 'dateofbirth' will present in the name of 'dob' in the XML.

you will see this notation often in go struct.

answered Sep 7, 2018 at 7:09

Vengatesh Subramaniyan

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