The phrase 'the foundational principle of' is correct and usable in written English.
You can use it in almost any situation when you need to refer to something that forms the basis for something else. For example, "The foundational principle of long-term success is commitment."
This is the foundational principle of the social era.
It is the foundational principle of academic freedom.
While our disagreements have been well-chronicled, and sometimes exaggerated, these professional disagreements were never personal, never disrespectful, and never challenged the foundational principle of civilian control of the military in our form of government...
Special advocates, who appear in existing closed hearings, have also criticised the plans as "a departure from the foundational principle of natural justice that all parties are entitled to see and challenge all the evidence relied upon before the court".
It is about precedent, and the foundational principle of the guaranteed contract – something that the players have fought long and hard to keep sacrosanct, something they watched their counterparts in the NFLPA compromise all too easily in their last round of collective bargaining, and something that should be found in far more places in our society than our just our playing fields.
Although liberals may oppose the Supreme Court's decision, in truth the foundational principle of neutrality set forth in the ruling will make it harder for religious conservatives (including those on the court) to argue for the constitutionality of school prayer and other state-sponsored support of religion.
Agency and collaboration are the opposite dispositions of routine and compliance--the foundational principles of the schools we inherited.
These are the foundational principles of the Earth Statement.
Literally one of the foundational principles of our democracy.
Senator Mitch McConnell of Kentucky, the Republican leader, called the law "abhorrent to the foundational principles" of the country.
All this — the mainstreaming of murderous hate — comes at a time of near-incendiary mutation of the foundational principles of India, and to the idea of India herself.
