On Google's hreflang documentation, in the 2-language example, it says:
Imagine you have an English language page hosted at http://www.example.com/, with a Spanish alternative at http://es.example.com/. You can indicate to Google that the Spanish URL is the Spanish-language equivalent of the English page in one of three ways:
HTML link element in header. In the HTML
<head>section of http://www.example.com/, add alinkelement pointing to the Spanish version of that webpage at http://es.example.com/, like this:<link rel="alternate" hreflang="es" href="http://es.example.com/" />
But in its 3-language example, it says:
If you have multiple language versions of a URL, each language page must identify all language versions, including itself. For example, if your site provides content in French, English, and Spanish, the Spanish version must include a rel="alternate" hreflang="x" link for itself in addition to links to the French and English versions. Similarly, the English and French versions must each include the same references to the French, English, and Spanish versions.
The above is an example for a 3-language site. My website consists of only 2 languages - the default/main ENGLISH and THAI. Do I have to add the tag for the page itself? Google's documentation is not clear about this point and in its example for 2-language site, it is not mentioned.
For example, this is what I put in http://janwawa.com/en/contact.php
<!-- GOOGLE INTERNATIONAL LANGUAGE TARGETING -->
<link rel="alternate" hreflang="th" href="http://janwawa.com/th/contact.php">
<link rel="alternate" hreflang="x-default" href="http://janwawa.com/en/contact.php">
</head>
Is the above correct? Or should I use:
<!-- GOOGLE INTERNATIONAL LANGUAGE TARGETING -->
<link rel="alternate" hreflang="en" href="http://janwawa.com/en/contact.php">
<link rel="alternate" hreflang="th" href="http://janwawa.com/th/contact.php">
<link rel="alternate" hreflang="x-default" href="http://janwawa.com/en/contact.php">
</head>