CHAPTER 4
380
Graphics
Usage and Usage Application Dictionaries
Optional content groups are typically constructed to control the visibility of
graphic objects that are related in some way. Objects can be related in several
ways; for example, a group may contain content in a particular language or con-
tent suitable for viewing at a particular magnification.
An optional content group’s usage dictionary (the value of the
Usage
entry in an
optional content group dictionary; see Table 4.48) contains information describ-
ing the nature of the content controlled by the group. This dictionary can contain
any combination of the entries shown in Table 4.52.
TABLE 4.52 Entries in an optional content usage dictionary
KEY
TYPE
VALUE
CreatorInfo
dictionary
(Optional)
A dictionary used by the creating application to store application-spe-
cific data associated with this optional content group. It contains two required en-
tries:
•
Creator
: A text string specifying the application that created the group.
•
Subtype
: A name defining the type of content controlled by the group. Suggest-
ed values include but are not limited to
Artwork
, for graphic-design or publish-
ing applications, and
Technical
, for technical designs such as building plans or
schematics.
Additional entries may be included to present information relevant to the creat-
ing application or related applications.
Note:
Groups whose
Intent
entry contains
Design
typically include a
CreatorInfo
en-
try.
Language
dictionary
(Optional)
A dictionary specifying the language of the content controlled by this
optional content group. It has two entries:
•
Lang
(required):
A text string that specifies a language and possibly a locale (see
es-MX
repre-
sents Mexican Spanish.
•
Preferred
(optional):
A name whose values may be
ON
or
OFF
. Default value:
OFF
. It is used by viewer applications when there is a partial match but no exact
match between the system language and the language strings in all usage dic-
tionaries. See “Usage and Usage Application Dictionaries” on page 380 for
more information.