This comma delimited file has commas as the delimiter, separating each field of the file.
The function takes an array as the argument and you can specify the item delimiter.
A field is a (possibly empty) maximal substring of s not containing any delimiter.
Conditions under which control characters match a space delimiter are none.
In practice, a branch is usually a single delimiter.
In a start-tag, the element name must immediately follow the tag open delimiter ` ' .