SECTION 10.7
893
Tagged PDF
ing text to another application or file format that has a limited repertoire of
available fonts.
in CSS and XSL; the W3C document
Extensible Stylesheet Language (XSL) 1.0
provides more information (see the Bibliography). Each of the characteristics can
be derived from information available in the font descriptor’s
Flags
entry (see
TABLE 10.18 Derivation of font characteristics
CHARACTERISTIC
TYPE
DERIVATION
Serifed
Proportional
Italic
Smallcap
boolean
boolean
boolean
boolean
The value of the Serif flag in the font descriptor’s
Flags
entry
The complement of the FixedPitch flag in the font descriptor’s
Flags
entry
The value of the Italic flag in the font descriptor’s
Flags
entry
The value of the SmallCap flag in the font descriptor’s
Flags
entry
Note:
The characteristics shown in the table apply only to character codes con-
tained in show strings within content streams. They do not exist for alternate de-
scription text (
Alt
), replacement text (
ActualText
), or abbreviation expansion text
(
E
).
Note:
For the standard 14 Type 1 fonts, the font descriptor may be missing; the well-
known values for those fonts are used.
Tagged PDF in PDF 1.5 defines a wider set of font characteristics, which provide
information needed when converting PDF to other files formats such as RTF,
HTML, XML, and OEB, and also improve accessibility and reflow of tables.
font selector attributes
and shows how their values are de-
rived.
Note:
If the
FontFamily
,
FontWeight
and
FontStretch
fields are not present in the font de-
scriptor, these values are derived from the font name in an implementation-defined
manner.