for all apparent purposes = it seems?

The title, author and year of publication of the book would constitute valuable context.

However, the phrase you ask about is common enough and seems (!) to convey the idea of something seemingly being the case.

Thanks.
Did you mean I've guessed it right in the title of the rhread?

The sentence is from English Self-taught, irrelevant to the sentence or the author lacks the concept of offering"full context" for a proper discussion.

Let us be the judges of what is proper context. You ask the questions, from the subordinate, weaker position of the seeker after knowledge. We provide the answers from the superior, more powerful position of providers of knowledge. Therefore show respect and exercise humility. Thus you will find the path to wisdom and become a great sage.