CHAPTER 10
916
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.
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
SpaceBefore
SpaceAfter
StartIndent*
EndIndent*
TextIndent*
TextAlign*
BBox
Width
Height
Any BLSE
ILSEs with
Placement
other than
Inline
BLSEs containing text
Illustration elements (
Figure
,
Formula
,
Form)
Table