Controls the start number of the first heading on a page.
Use this property to control the number of the first heading.
Since version 3.0 this is a string value to define the heading in the form of point-separated digits. Each digit stands for the sequence value of a heading number at the given level. For instance 4.2 refers the sequence number 4 on the first (h1) and 2 on the second level (h2). Prior to version 3.0 the value for this property has been a single digit to define the first level heading.
Please note that the value is independent from the Heading Starting Level.
