package sitemap

import "text/template"

const (
	templateText = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"
  xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  {{ range . }}
    <url>
      <loc>{{ .Loc }}</loc>
      {{ if .ChangeFreq }}
        <changefreq>{{ .ChangeFreq }}</changefreq>
      {{ end }}
      {{ if .Priority }}
        <priority>{{ .Priority }}</priority>
      {{ end }}
      {{ if .LastMod }}
        <lastmod>{{ .LastMod }}</lastmod>
      {{ end }}
    </url>
  {{ end }}
</urlset>
`
)

var (
	parsedTemplate *template.Template
	parsingError   error
)

func init() {
	// Try to parse the sitemap template, but defer error checking until execution.
	parsedTemplate, parsingError = template.New("sitemap").Parse(templateText)
}