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                                                   932
        CHAPTER 10                                                          Document Interchange



        Column Attributes

        The attributes described in Table 10.33 apply only to the grouping elements Art,
        Sect, and Div (see “Grouping Elements” on page 899). They are used when the
        content in the grouping element is divided into columns.

                              TABLE 10.33 Standard column attributes
KEY            TYPE         VALUE

ColumnCount    integer      (Optional; not inheritable; PDF 1.6) The number of columns in the content of the
                            grouping element. Default value: 1.

ColumnGap      number or    (Optional; not inheritable; PDF 1.6) The desired space between adjacent col-
               array        umns, measured in default user space units in the inline-progression direction.
                            If the value is a number, it specifies the space between all columns. If the value is
                            an array, it should contain ColumnCount - 1 numbers, representing the space be-
                            tween the first and second columns, the second and third columns, and so on,
                            respectively. If there are fewer than ColumnCount - 1 numbers, the last element
                            specifies all remaining spaces; excess array elements are ignored.

ColumnWidths   number or    (Optional; not inheritable; PDF 1.6) The desired width of the columns, measured
               array        in default user space units in the inline-progression direction. If the value is a
                            number, it specifies the width of all columns. If the value is an array, it should
                            contain ColumnCount numbers, representing the width of each column, in or-
                            der. If there are fewer than ColumnCount numbers, the last element specifies all
                            remaining widths; excess array elements are ignored.


        List Attribute

        The ListNumbering attribute, described in Table 10.34, is carried by an L (List)
        element, but controls the interpretation of the Lbl (Label) elements within the
        list’s LI (List item) elements (see “List Elements” on page 902). This attribute is de-
        fined in attribute objects whose O (owner) entry has the value List (or is one of
        the format-specific owner names listed in Table 10.28 on page 914).

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