Take the 2-minute tour ×  I have a problem with the definite
article 'the' in following sentence from Wikipedia:  Some of the
namespaces may or may not be officially considered part of the
BCL by Microsoft, but all are included as part of the libraries
that are provided with Microsoft's implementation of the .NET
Framework.  (BCL: Base Class Library)  Firstly, the sentence
starts with 'Some of the namespaces', which is correct, because
there are many namespaces and the author refers to a group of
those namespaces. Next, 'part of the BCL by Microsoft': here is
my problem. There is only one BCL, so 'the' is not indicating
any specific member of a group. Secondly, just as 'the BCL',
there is only one 'Microsoft', but it doesn't have 'the'. So how
is this sentence correct?  My definition of 'the' has two parts.
First, indication of a group and second, referring to a specific
member in that group. For example, 'the teacher in school was
pretty'. Here, school has many teachers and we refer to a
specific teacher.  s