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Description of a kind of PDF object using a pattern.
Pattern sequence should contain strings, singletons of form [string] or
PDFPatternIf objects.
Strings are literal strings to be used in the object.
Singletons are names of keyword arguments to include.
PDFpatternIf objects allow some conditionality.
Keyword arguments can be non-instances which are substituted directly in string conversion,
or they can be object instances in which case they should be pdfdoc.* style
objects with a x.format(doc) method.
Keyword arguments may be set on initialization or subsequently using __setitem__, before format.
"constant object" instances can also be inserted in the patterns.
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__module__� __qualname__� __RefOnly__r r" r$ r( r r: � r r r r s% � ��K�%�&%�$�0�2 �r r c � � e Zd ZdZg g fd�Zy)r z�cond will be evaluated as [cond] in PDFpattern eval.
It should evaluate to a list with value 0/1 etc etc.
thenPart is a list to be evaluated if the cond evaulates true,
elsePart is the false sequence.
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