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                                          916
CHAPTER 10                                                        Document Interchange



Layout Attributes

Layout attributes specify parameters of the layout process used to produce the
appearance described by a document’s PDF content. Attributes in this category
are defined in attribute objects whose O (owner) entry has the value Layout (or is
one of the format-specific owner names listed in Table 10.28 on page 914). The
intent is that these parameters can be used to reflow the content or export it to
some other document format with at least basic styling preserved.

Table 10.32 summarizes the standard layout attributes and the structure elements
to which they apply. The following sections describe the meaning and usage of
these attributes.

Note: An asterisk (*) after the attribute name indicates that the attribute is inherit-
able. As described in “Attribute Values and Inheritance” on page 914, an inheritable
attribute may be specified for any element to propagate it to descendants, regardless
of whether it is meaningful for that element.

                         TABLE 10.29 Standard layout attributes
STRUCTURE ELEMENTS                   ATTRIBUTES

Any structure element                Placement
                                     WritingMode*
                                     BackgroundColor
                                     BorderColor*
                                     BorderStyle
                                     BorderThickness*
                                     Color*
                                     Padding

Any BLSE                             SpaceBefore
ILSEs with Placement other than      SpaceAfter
Inline                               StartIndent*
                                     EndIndent*

BLSEs containing text                TextIndent*
                                     TextAlign*

Illustration elements (Figure,       BBox
Formula, Form)                       Width
Table                                Height

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