Added more error handling and necessary functions

text.go

@@ -14,17 +14,11 @@ type Text interface {
 func NewText(textType, content string) (Text, error) {
 	switch textType {
 	case "text", "":
-		return &PlainText{Type: textType, Text: content}, nil
+		return newPlainText(textType, content)
 	case "html":
-		return &PlainText{Type: textType, Text: html.UnescapeString(content)}, nil
+		return newPlainText(textType, html.UnescapeString(content))
 	case "xhtml":
-		return &XHTMLText{
-			Type: textType,
-			XHTMLDiv: &XHTMLDiv{
-				XMLNS:   "http://www.w3.org/1999/xhtml",
-				Content: content,
-			},
-		}, nil
+		return newXHTMLText(textType, content)
 	default:
 		return nil, fmt.Errorf("%v is not a valid text type", textType)
 	}