APPENDIX H
1116
Compatibility and Implementation Notes
99. In PDF 1.2, additional-actions dictionaries were inheritable; beginning
with PDF 1.3, they are not inheritable.
100. In Acrobat 3.0, the
O
and
C
events in a page object’s additional-actions
dictionary are ignored if the document is not being displayed in a page-
oriented layout mode. Beginning with Acrobat 4.0, the actions associated
with these events are executed if the document is in a page-oriented or
single-column layout and are ignored if the document is in a multiple-col-
umn layout.
101. The Acrobat viewer for the Windows platform uses the Windows function
ShellExecute
to launch an application. The
Win
dictionary entries corre-
spond to the parameters of
ShellExecute
.
102. URI actions are resolved by the Acrobat WebLink plug-in extension.
103. If the appropriate plug-in extension (WebLink) is not present, Acrobat
viewers report the following error when a link annotation that uses a URI
action is activated: “The plug-in required by this URI action is not avail-
able.”
104. In PDF 1.2, the value of the
Sound
entry was allowed to be a file specifica-
tion. Beginning with PDF 1.3, this is not supported, but the same effect
can be achieved by using an external stream.
105. Acrobat viewers mute the sound if the value of
Volume
is negative; other-
wise, this entry is ignored.
106. Acrobat 6.0 does not support the
Synchronous
entry.
107. Acrobat 5.0 and earlier viewers do not support the
Mix
entry.
108. Acrobat viewers earlier than version 3.0 report an error when they en-
counter an action of type
Movie
.