meta.go

package main

import (
    "reflect"
    "fmt"
)

func main() {
    var x struct {
        MyField int `core:"required"`
    }
    t := reflect.TypeOf(x)

    for i := 0; i < t.NumField(); i++ {
        field := t.Field(i)
        fmt.Println(field.Name, ":", field.Tag.Get("core"))
    }
}