func New() *Sitemap {
	return &Sitemap{
		Xmlns: "http://www.sitemaps.org/schemas/sitemap/0.9",
		URLs:  make([]*URL, 0),
	}
}
New returns a new Sitemap.
package sitemap
import (
	"encoding/xml"
	"github.com/snabb/diagio"
	"io"
	"time"
)
type ChangeFreq string
const (
	Always  ChangeFreq = "always"
	Hourly  ChangeFreq = "hourly"
	Daily   ChangeFreq = "daily"
	Weekly  ChangeFreq = "weekly"
	Monthly ChangeFreq = "monthly"
	Yearly  ChangeFreq = "yearly"
	Never   ChangeFreq = "never"
)
type URL struct {
	Loc        string     `xml:"loc"`
	LastMod    *time.Time `xml:"lastmod,omitempty"`
	ChangeFreq ChangeFreq `xml:"changefreq,omitempty"`
	Priority   float32    `xml:"priority,omitempty"`
}
type Sitemap struct {
	XMLName xml.Name `xml:"urlset"`
	Xmlns   string   `xml:"xmlns,attr"`
	URLs []*URL `xml:"url"`
	Minify bool `xml:"-"`
}