Plasmodium falciparum is a protozoan parasite that causes an infectious disease known as malaria. P. falciparum is the most severe strain of the malaria species correlated with almost every malarial death. [1] The other 3 species that cause malaria include: P. vivax, P. ovale, and P. malariae.
To set the value of a Boolean attribute, such as disabled, you can specify any value. An empty string or the name of the attribute are recommended values. All that matters is that if the attribute is present at all, regardless of its actual value, its value is considered to be true.
An attribute in a class is a variable that is attached to the class. That means that whenever you use the class, you are also creating a variable that is attached to the class namespace. Now, a little detour about namespaces. A namespace is just a mapping from names to objects.