constructor(numDataCodewords, codewords) {
			this.numDataCodewords = numDataCodewords;
			this.codewords = codewords;
		}
<p>Encapsulates a block of data within a Data Matrix Code. Data Matrix Codes may split their data into
multiple blocks, each of which is a unit of data and error-correction codewords. Each
is represented by an instance of this class.</p>

@author bbrown@google.com (Brian Brown)