func (m *Microdata) addItem(item *Item) {
	m.Items = append(m.Items, item)
}
addItem adds the item to the items list.
package microdata
import (
	"bytes"
	"io"
	"net/http"
	"net/url"
	"strings"
	"golang.org/x/net/html"
	"golang.org/x/net/html/atom"
	"golang.org/x/net/html/charset"
)
type Microdata struct {
	Items []*Item `json:"items"`
}