The Textile Markup Reference for Textpattern
Block quotations designate long quotations where a paragraph break is appropriate. It ends with a blank line.
1) Block quotes may include a citation URL immediately following the period:
bq.:http://textpattern.com/ A cited quotation.
2) For more than one paragraph, use two periods. Any block modifier to follow, such as
p. will end the block quotation:
code into the box above.