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28. class PageNoField: Page number field

This class inherits from FieldItem, but it doesn't have a .scanField() method because the page number comes from the compiler's PageHeader object.
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class PageNoField(FieldItem):
    '''Represents a page number field.

      Exports:  As inherited.

28.1. PageNoField.flatten()

Generic field flattener for a page number. Page numbers are always right-justified in the output field.
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    def flatten(pageNoField):
        '''Flatten a PageNoField.
        if  pageNoField is None:
            return BLANK_PAGE_NO
            return pageNoField.value.rjust(PAGE_NO_L)