class Kramdown::Parser::RFC2629Kramdown

def parse_block_pi
  # warn [:BLOCK].inspect
  line = @src.current_line_number
  if (result = @src.scan(HTML_INSTRUCTION_RE))
    @tree.children << Element.new(:xml_pi, result, nil, category: :block, location: line)
    @src.scan(TRAILING_WHITESPACE)
    true
  else
    false
  end
end