Expropriation Standards in Investment Rules

From the previously mentioned Norwegian draft model BIT (MS Word document) that reader Perry Bechky pointed me to:

ARTICLE [6]: EXPROPRIATION

1. A Party shall not expropriate or nationalise an investment of an investor of the other Party except in the public interest and subject to the conditions provided for by law and by the general principles of international law.

...

What's noticeably absent is the "measures equivalent to expropriation or nationalization" or "measures tantamount to nationalization or expropriation" language.

I'm not sure how much detail we will get during the campaign about the specifics of trade agreement rules, but I wonder if this meets the goal of Senator Obama, mentioned here, that "... With regards to provisions in several FTAs that give foreign investors the right to sue governments directly in foreign tribunals, I will ensure that foreign investor rights are strictly limited and will fully exempt any law or regulation written to protect public safety or promote the public interest."