virtual NxsBlock* NxsBlockFactory::GetBlockReaderForID	(	const std::string &	id,
		NxsReader *	reader,
		NxsToken *	token
	)			`[pure virtual]`

Returns:: a NxsBlock instance with NxsBlock::Read method that is capable of parsing a NEXUS block of type `id`

Parameters:

	id	The type of block that needs to be read see Block Type IDs or Block IDs
	reader	a pointer to the NxsReader controlling the parse. Can be NULL. Usually not needed for an implementation of this method
	token	a pointer to the NxsToken that is generating token. Can be NULL. Usually not needed for an implementation of this method