An identifier is a name that identifies either a unique object or a unique class of objects, where the "object" or class may be an idea, physical object, or physical substance. The abbreviation ID refers to identity, identification, or an identifier. An identifier may be a word, letter, symbol, or any combination of those; the words, letters, or symbols may follow an encoding system or they may be arbitrary. When an identifier follows an encoding system, it is referred to as a code or ID code. For instance the ISO/IEC 11179 metadata registry standard defines a code as system of valid symbols that substitute for longer values in contrast to identifiers without symbolic meaning. Identifiers that do not follow any encoding scheme are said to be arbitrary IDs; the unique identifier is an identifier that refers to only one instance—only one particular object in the universe. A part number is an identifier, but it is not a unique identifier—for that, a serial number is needed, to identify each instance of the part design.

Thus the identifier "Model T" identifies the class of automobiles. The concepts of name and identifier are denotatively equal, the terms are thus denotatively synonymous. For example, both "Jamie Zawinski" and "Netscape employee number 20" are identifiers for the same specific human being; this is an emic indistinction rather than an etic one. In metadata, an identifier is a language-independent label, sign or token that uniquely identifies an object within an identification scheme; the suffix "identifier" is used as a representation term when naming a data element. ID codes may inherently carry metadata along with them. For example, when you know that the food package in front of you has the identifier "2011-09-25T15:42Z-MFR5-P02-243-45", you not only have that data, you have the metadata that tells you that it was packaged on September 25, 2011, at 3:42pm UTC, manufactured by Licensed Vendor Number 5, at the Peoria, IL, USA plant, in Building 2, was the 243rd package off the line in that shift, was inspected by Inspector Number 45.

Arbitrary identifiers might lack metadata. For example, if a food package just says 100054678214, its ID may not tell anything except identity—no date, manufacturer name, production sequence rank, or inspector number. In some cases, arbitrary identifiers such as sequential serial numbers leak information. Opaque identifiers—identifiers designed to avoid leaking that small amount of information—include "really opaque pointers" and Version 4 UUIDs. In computer science, identifiers are lexical tokens. Identifiers are used extensively in all information processing systems. Identifying entities makes it possible to refer to them, essential for any kind of symbolic processing. In computer languages, identifiers are tokens; some of the kinds of entities an identifier might denote include variables, labels and packages. Many resources may carry multiple identifiers. Typical examples are: One person with multiple names and forms of address For example: One specific person may be identified by all of the following identifiers: Jane Smith.

One document with multiple versions One substance with multiple names The inverse is possible, where multiple resources are represented with the same identifier. Many codes and nomenclatural systems originate within a small namespace. Over the years, some of them bleed into larger namespaces; when such dissemination happens, the limitations of the original naming convention, latent and moot, become painfully apparent necessitating retronymy, translation/transcoding, so on. Such limitations accompany the shift away from the original context to the broader one; the system shows implicit context, lack of capacity, lack of extensibility (no features defined and rese

Carmet is a census-designated place in Sonoma County, California. Carmet sits at an elevation of 180 feet; the 2010 United States census reported Carmet's population was 47. According to the United States Census Bureau, the CDP covers an area of 0.3 square miles, all of it land. The 2010 United States Census reported that Carmet had a population of 47; the population density was 164.0 people per square mile. The racial makeup of the CDP was 91.5% White, 2.1% Asian, 6.4% from two or more races. 0.0 % of the population was Latino of any race. The Census reported. There were 29 households, out of which 1 had children under the age of 18 living in them, 11 were opposite-sex married couples living together, 0 had a female householder with no husband present, 1 had a male householder with no wife present. There were 3 unmarried opposite-sex partnerships, 0 same-sex married couples or partnerships. 15 households were made up of individuals and 4 had someone living alone, 65 years of age or older. The average household size was 1.62.

There were 12 families. The population was spread out with 2 people under the age of 18, 0 people aged 18 to 24, 6 people aged 25 to 44, 24 people aged 45 to 64, 15 people who were 65 years of age or older; the median age was 59.3 years. For every 100 females, there were 95.8 males. For every 100 females age 18 and over, there were 87.5 males. There were 68 housing units at an average density of 237.2 per square mile, of which 82.8% were owner-occupied and 17.2% were occupied by renters. The homeowner vacancy rate was 7.7%. 85.1% of the population lived in owner-occupied housing units and 14.9% lived in rental housing units

Joseph Weldon Bailey, Sr. was a United States Senator, United States Representative, a Bourbon Democrat, famous for his speeches extolling conservative causes, such as opposition to woman suffrage or restrictions on child labor. He served as a Congressional Representative between 1891 and 1901, as the House minority leader from 1897 until 1899. In 1901, he was elected to the Senate, serving until 1913. Historian Elna C. Green says that Bailey was known in Texas as a rigorous defender of states' rights, constitutional conservatism, governmental economy, his opponents considered him the symbol of corruption in government. Born in Crystal Springs in Copiah County outside Jackson, Bailey attended the University of Mississippi at Oxford, where in 1879 he joined the prestigious Delta Psi fraternity. Bailey was admitted to the bar in Mississippi in 1883, he moved to Gainesville in north Texas in 1885. He had been politically active as a Democrat in both Mississippi and his new home and had a reputation as an excellent public speaker who promoted Jeffersonian democracy.

He was elected to the House in 1891 and distinguished himself as leading advocate for free silver, which contributed to his election as Minority leader of the United States House of Representatives in 1897. He exerted considerable influence on his colleagues, but struggled to unify his divided caucus. On April 14, 1897, some House Democrats, led by David A. De Armond sought to block a three day adjournment, a maneuver understood as a repudiation of Bailey's cooperative relationship with Republican Speaker Thomas Brackett Reed. Bailey's most severe disappointment as minority leader came in 1898, when Bailey argued that congressmen who had accepted commissions to serve in the army without resigning from Congress had violated the Ineligibility Clause of the Constitution. Despite Bailey's advocacy, when the House voted on a motion for whether to consider a resolution which would have removed several members from Congress who had held commissions during the Spanish-American War, a majority of Democrats opposed the motion.

The next day, Bailey declared that he would not be a candidate for minority leader in the next Congress. He was elected to the U. S. Senate in 1901, his political career was tarnished by an assault against Senator Albert J. Beveridge, an Indiana Republican. Subsequent investigations brought to light suspicious income and financial ties that Bailey had to the burgeoning oil industry. Financial allegations against Bailey in 1906 threatened his reelection to the Senate, a task the prerogative of the Texas legislature, rather than party voters, his tenure ended on January 1913 when he resigned his Senate seat. After his defeat by Pat M. Neff in the Democratic gubernatorial primary in 1920, Bailey moved to Dallas to practice law. In 1929, he died in a courtroom in Texas. Acheson, Sam Hanna. Joe Bailey, The Last Democrat Gould, Lewis. Progressives and Prohibitionists: Texas Democrats in the Wilson Era, United States Congress. "BAILEY, Joseph Weldon". Biographical Directory of the United States Congress. Joseph Weldon Bailey from the Handbook of Texas Online Joseph Weldon Bailey at Find a Grave early photo This article incorporates public domain material from the Biographical Directory of the United States Congress website http://bioguide.congress.gov