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                                       1105
S E C T I O N H .3                                            Implementation Notes



  37. In a document containing articles, if the first page that has an article bead
      does not have a B entry, Acrobat viewers rebuild the B array for all pages of
      the document.
  38. In PDF 1.2, additional-actions dictionaries were inheritable; beginning
      with PDF 1.3, they are not inheritable.


3.7.1, “Content Streams”
  39. Acrobat viewers report an error the first time they find an unknown oper-
      ator or an operator with too few operands, but continue processing the
      content stream. No further errors are reported.


3.9.1, “Type 0 (Sampled) Functions”
  40. When printing, Acrobat performs only linear interpolation, regardless of
      the value of the Order entry.


3.9.2, “Type 2 (Exponential Interpolation) Functions”
  41. Since Type 2 functions are not defined in PDF 1.2 or earlier versions,
      Acrobat 3.0 (whose native file format is PDF 1.2) reports an Invalid Func-
      tion Resource error if it encounters a function of this type.


3.9.3, “Type 3 (Stitching) Functions”
  42. Since Type 3 functions are not defined in PDF 1.2 or earlier versions,
      Acrobat 3.0 (whose native file format is PDF 1.2) reports an error, “Invalid
      Function Resource,” if it encounters a function of this type.


3.9.4, “Type 4 (PostScript Calculator) Functions”
  43. Since Type 4 functions are not defined in PDF 1.2 or earlier versions,
      Acrobat 3.0 (whose native file format is PDF 1.2) reports an error, “Invalid
      Function Resource,” if it encounters a function of this type.
  44. Acrobat uses single-precision floating-point numbers for all real-number
      operations in a type 4 function.

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