Represents a single block, e.g. a paragraph. A block is made up of lines.
Represents a single glyph, i.e. a character.
Represents a single line. A line is made up of words.
Base class for units of text, e.g. glyphs, words, lines, blocks, pages.
Represents result of performing OCR on an image. A page is made up of blocks.
Represents a single word. A word is made up of glyphs.