Public service announcement

A public service announcement (PSA) or community service announcement (CSA) is a non-commercial advertisement broadcast on radio or television, ostensibly for the public good. PSAs are intended to modify public attitudes by raising awareness about specific issues.
The most common topics of PSAs are health and safety. A typical PSA is part of a public awareness campaign to inform or educate the public about an issue such as smoking or compulsive gambling.
Often, a charitable organization releasing a PSA enlists the support of a celebrity; examples include Michael J. Fox's PSAs in the U.S. supporting research into Parkinson's Disease and Crips street gang leader Stanley "Tookie" Williams speaking from prison to urge youth not to join gangs.
Some religious groups produce PSAs on non-religious themes such as family values. Examples include the long-running "Homefront" campaign from The Church of Jesus Christ of Latter-day Saints, Seventh-day Adventist Church, and more recently the United Methodist Church.
The military produces PSAs to recruit enlistees, in addition to paid advertising and sponsorship efforts.
In the U.S, the role of PSAs was affected by deregulation of the broadcasting industry in the 1980s. Previously, a broadcast license was assigned to a television or radio station that was expected to serve as a "public trustee" by airing PSAs (in addition to meeting other requirements).
Untited States producers distribute traditional PSAs distributed to station directors.

ANSI/NISO/ISO 12083 Electronic Manuscript Preparation and Markup

Provides document architectures for the creation and interchange of books, articles, serial publications, and application-embedded mathematics. It provides a toolkit for publication developers to use as a basis for creating custom applications for authors, publishers, libraries, their users, and/or their database vendors. The standard specifies the SGML declaration defining the syntax used by the document type definitions (DTD) and document instances, and a definition for mathematics which may be embedded in other SGML applications. The DTDs included have been designed to be flexible enough to expand or limit markup depending on the use of the application. The DTDs presented conform to ISO 8879.


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