ISO 24517-1:2008 is an ISO Standard published in 2008.

  • Document management—Engineering document format using PDF—Part 1: Use of PDF 1.6 (PDF/E-1)

This standard defines a format (PDF/E) for the creation of documents used in geospatial, construction and manufacturing workflows[1] and is based on the PDF Reference version 1.6 from Adobe Systems. The specification also supports interactive media, including animation and 3D.

PDF/E is a subset of PDF, designed to be an open and neutral exchange format for engineering and technical documentation.[2]

Filename extension.pdf
Type code'PDF ' (including a single space)
Magic number%PDF
Developed byISO
Extended fromPDF
StandardISO 24517


The PDF/E Standard specifies how the Portable Document Format (PDF) should be used for the creation of documents in engineering workflows.

Key benefits of PDF/E include:

  • Reduces requirements for expensive & proprietary software
  • Lower storage and exchange costs (vs. paper)
  • Trustworthy exchange across multiple applications and platforms
  • Self-contained
  • Cost-effective and accurate means of capturing markups
  • Developed and maintained by the PDF/E ISO committee

The Standard does not define a method for the creation or conversion from paper or electronic documents to the PDF/E format.

The Committee managing ISO 24517 (PDF/E) needs subject-matter experts to assist in the development of Part 2 of the Standard.

ISO 24517 (PDF/E) was created to meet the needs of organizations who need to reliably create, exchange and review engineering documentation, however, the first part of the standard does not address 3D, video or other dynamic content, nor does it address integrated source data.

See also


  1. ^ ISO 24517-1:2008 - Document management -- Engineering document format using PDF -- Part 1: Use of PDF 1.6 (PDF/E-1)
  2. ^ Creating PDF/E-ready files

External links

Alexander Fleming

Sir Alexander Fleming (6 August 1881 – 11 March 1955) was a Scottish physician, microbiologist, and pharmacologist. His best-known discoveries are the enzyme lysozyme in 1923 and the world's first antibiotic substance benzylpenicillin (Penicillin G) from the mould Penicillium notatum in 1928, for which he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Florey and Ernst Boris Chain. He wrote many articles on bacteriology, immunology, and chemotherapy.

Fleming was knighted for his scientific achievements in 1944. In 1999, he was named in Time magazine's list of the 100 Most Important People of the 20th century. In 2002, he was chosen in the BBC's television poll for determining the 100 Greatest Britons, and in 2009, he was also voted third "greatest Scot" in an opinion poll conducted by STV, behind only Robert Burns and William Wallace.

Beam me up, Scotty

"Beam me up, Scotty" is a catchphrase that made its way into popular culture from the science fiction television series Star Trek. It comes from the command Captain Kirk gives his chief engineer, Montgomery "Scotty" Scott, when he needs to be transported back to the Starship Enterprise.

Though it has become irrevocably associated with the series and films, the exact phrase was never actually spoken in any Star Trek television episode or film.

Despite this, the quote has become a phrase of its own over time. It can be used to describe one's desire to be elsewhere, technology such as teleportation, slang for certain drugs, or as a phrase to show appreciation and association with the television show.


The Celts (, see pronunciation of Celt for different usages) are an Indo-European ethnolinguistic group of Europe identified by their use of Celtic languages and cultural similarities. The history of pre-Celtic Europe and the exact relationship between ethnic, linguistic and cultural factors in the Celtic world remains uncertain and controversial. The exact geographic spread of the ancient Celts is disputed; in particular, the ways in which the Iron Age inhabitants of Great Britain and Ireland should be regarded as Celts have become a subject of controversy. According to one theory, the common root of the Celtic languages, the Proto-Celtic language, arose in the Late Bronze Age Urnfield culture of Central Europe, which flourished from around 1200 BC.According to a theory proposed in the 19th century, the first people to adopt cultural characteristics regarded as Celtic were the people of the Iron Age Hallstatt culture in central Europe (c. 800–450 BC), named for the rich grave finds in Hallstatt, Austria. Thus this area is sometimes called the "Celtic homeland". By or during the later La Tène period (c. 450 BC to the Roman conquest), this Celtic culture was supposed to have expanded by trans-cultural diffusion or migration to the British Isles (Insular Celts), France and the Low Countries (Gauls), Bohemia, Poland and much of Central Europe, the Iberian Peninsula (Celtiberians, Celtici, Lusitanians and Gallaeci) and northern Italy (Golasecca culture and Cisalpine Gauls) and, following the Celtic settlement of Eastern Europe beginning in 279 BC, as far east as central Anatolia (Galatians) in modern-day Turkey.The earliest undisputed direct examples of a Celtic language are the Lepontic inscriptions beginning in the 6th century BC. Continental Celtic languages are attested almost exclusively through inscriptions and place-names. Insular Celtic languages are attested beginning around the 4th century in Ogham inscriptions, although it was clearly being spoken much earlier. Celtic literary tradition begins with Old Irish texts around the 8th century CE. Coherent texts of Early Irish literature, such as the Táin Bó Cúailnge ("Cattle Raid of Cooley"), survive in 12th-century recensions.

By the mid-1st millennium, with the expansion of the Roman Empire and migrating Germanic tribes, Celtic culture and Insular Celtic languages had become restricted to Ireland, the western and northern parts of Great Britain (Wales, Scotland, and Cornwall), the Isle of Man, and Brittany. Between the 5th and 8th centuries, the Celtic-speaking communities in these Atlantic regions emerged as a reasonably cohesive cultural entity. They had a common linguistic, religious and artistic heritage that distinguished them from the culture of the surrounding polities. By the 6th century, however, the Continental Celtic languages were no longer in wide use.

Insular Celtic culture diversified into that of the Gaels (Irish, Scottish and Manx) and the Celtic Britons (Welsh, Cornish, and Bretons) of the medieval and modern periods. A modern Celtic identity was constructed as part of the Romanticist Celtic Revival in Great Britain, Ireland, and other European territories, such as Portugal and Spanish Galicia. Today, Irish, Scottish Gaelic, Welsh, and Breton are still spoken in parts of their historical territories, and Cornish and Manx are undergoing a revival.

Considered harmful

Considered harmful is a part of a phrasal template used in the titles of at least 65 critical essays in computer science and related disciplines.

Its use in this context originated in 1968 with Edsger Dijkstra's letter "Go To Statement Considered Harmful".

Direct democracy

Direct democracy or pure democracy is a form of democracy in which people decide on policy initiatives directly. This differs from the majority of currently established democracies, which are representative democracies.


EPUB is an e-book file format that uses the ".epub" file extension. The term is short for electronic publication and is sometimes styled ePub. EPUB is supported by many e-readers, and compatible software is available for most smartphones, tablets, and computers. EPUB is a technical standard published by the International Digital Publishing Forum (IDPF). It became an official standard of the IDPF in September 2007, superseding the older Open eBook standard.The Book Industry Study Group endorses EPUB 3 as the format of choice for packaging content and has stated that the global book publishing industry should rally around a single standard. The EPUB format is implemented as an archive file consisting of HTML files carrying the content, along with images and other supporting files. EPUB is the most widely supported vendor-independent XML-based (as opposed to PDF) e-book format; that is, it is supported by the largest number of hardware readers.

Edsger W. Dijkstra

Edsger Wybe Dijkstra (; Dutch: [ˈɛtsxər ˈʋibə ˈdɛikstra] (listen); 11 May 1930 – 6 August 2002) was a Dutch systems scientist, programmer, software engineer, science essayist, and pioneer in computing science. A theoretical physicist by training, he worked as a programmer at the Mathematisch Centrum (Amsterdam) from 1952 to 1962. A university professor for much of his life, Dijkstra held the Schlumberger Centennial Chair in Computer Sciences at the University of Texas at Austin from 1984 until his retirement in 1999. He was a professor of mathematics at the Eindhoven University of Technology (1962–1984) and a research fellow at the Burroughs Corporation (1973–1984).

One of the most influential figures of computing science's founding generation, Dijkstra helped shape the new discipline from both an engineering and a theoretical perspective. His fundamental contributions cover diverse areas of computing science, including compiler construction, operating systems, distributed systems, sequential and concurrent programming, programming paradigm and methodology, programming language research, program design, program development, program verification, software engineering principles, graph algorithms, and philosophical foundations of computer programming and computer science. Many of his papers are the source of new research areas. Several concepts and problems that are now standard in computer science were first identified by Dijkstra or bear names coined by him. As a foremost opponent of the mechanizing view of computing science, he refuted the use of the concepts of 'computer science' and 'software engineering' as umbrella terms for academic disciplines.

Until the mid-1960s computer programming was considered more an art (or a craft) than a scientific discipline. In Harlan Mills's words (1986), "programming [before the 1970s] was regarded as a private, puzzle-solving activity of writing computer instructions to work as a program". In the late 1960s, computer programming was in a state of crisis. Dijkstra was one of a small group of academics and industrial programmers who advocated a new programming style to improve the quality of programs. Dijkstra, who had a background in mathematics and physics, was one of the driving forces behind the acceptance of computer programming as a scientific discipline. He coined the phrase "structured programming" and during the 1970s this became the new programming orthodoxy. His ideas about structured programming helped lay the foundations for the birth and development of the professional discipline of software engineering, enabling programmers to organize and manage increasingly complex software projects. As Bertrand Meyer (2009) noted, "The revolution in views of programming started by Dijkstra's iconoclasm led to a movement known as structured programming, which advocated a systematic, rational approach to program construction. Structured programming is the basis for all that has been done since in programming methodology, including object-oriented programming."The academic study of concurrent computing started in the 1960s, with Dijkstra (1965) credited with being the first paper in this field, identifying and solving the mutual exclusion problem. He was also one of the early pioneers of the research on principles of distributed computing. His foundational work on concurrency, semaphores, mutual exclusion, deadlock (deadly embrace), finding shortest paths in graphs, fault-tolerance, self-stabilization, among many other contributions comprises many of the pillars upon which the field of distributed computing is built. Shortly before his death in 2002, he received the ACM PODC Influential-Paper Award in distributed computing for his work on self-stabilization of program computation. This annual award was renamed the Dijkstra Prize (Edsger W. Dijkstra Prize in Distributed Computing) the following year, in his honor. As the prize, sponsored jointly by the ACM Symposium on Principles of Distributed Computing (PODC) and the EATCS International Symposium on Distributed Computing (DISC), recognizes that "No other individual has had a larger influence on research in principles of distributed computing".


Eritrea (; (listen)), officially the State of Eritrea is a country in the Horn of Africa, with its capital at Asmara. It is bordered by Sudan in the west, Ethiopia in the south, and Djibouti in the southeast. The northeastern and eastern parts of Eritrea have an extensive coastline along the Red Sea. The nation has a total area of approximately 117,600 km2 (45,406 sq mi), and includes the Dahlak Archipelago and several of the Hanish Islands. Its toponym Eritrea is based on the Greek name for the Red Sea (Ἐρυθρὰ Θάλασσα Erythra Thalassa), which was first adopted for Italian Eritrea in 1890.

Eritrea is a multi-ethnic country, with nine recognized ethnic groups in its population of around 5 million. Most residents speak languages from the Afroasiatic family, either of the Ethiopian Semitic languages or Cushitic branches. Among these communities, the Tigrinyas make up about 55% of the population, with the Tigre people constituting around 30% of inhabitants. In addition, there are a number of Nilo-Saharan-speaking Nilotic ethnic minorities. Most people in the territory adhere to Christianity or Islam.The Kingdom of Aksum, covering much of modern-day Eritrea and northern Ethiopia, was established during the first or second centuries AD. It adopted Christianity around the middle of the fourth century. In medieval times much of Eritrea fell under the Medri Bahri kingdom, with a smaller region being part of Hamasien.

The creation of modern-day Eritrea is a result of the incorporation of independent, distinct kingdoms and sultanates (for example, Medri Bahri and the Sultanate of Aussa) eventually resulting in the formation of Italian Eritrea. After the defeat of the Italian colonial army in 1942, Eritrea was administered by the British Military Administration until 1952. Following the UN General Assembly decision, in 1952, Eritrea would govern itself with a local Eritrean parliament but for foreign affairs and defense it would enter into a federal status with Ethiopia for a period of 10 years. However, in 1962 the government of Ethiopia annulled the Eritrean parliament and formally annexed Eritrea. But the Eritreans that argued for complete Eritrean independence since the ouster of the Italians in 1941, anticipated what was coming and in 1960 organized the Eritrean Liberation Front in opposition. In 1991, after 30 years of continuous armed struggle for independence, the Eritrean liberation fighters entered the capital city, Asmara, in victory.

Eritrea is a one-party state in which national legislative elections have never been held since independence. According to Human Rights Watch, the Eritrean government's human rights record is among the worst in the world. The Eritrean government has dismissed these allegations as politically motivated. The compulsory military service requires long, indefinite conscription periods, which some Eritreans leave the country to avoid. Because all local media is state-owned, Eritrea was also ranked as having the second-least press freedom in the global Press Freedom Index, behind only North Korea.

The sovereign state of Eritrea is a member of the African Union, the United Nations, and the Intergovernmental Authority on Development, and is an observer in the Arab League alongside Brazil, Venezuela, India and Turkey.


Galicians (Galician: galegos, Spanish: gallegos) are a national, cultural and ethnic group whose historic homeland is Galicia, in the north-west of the Iberian Peninsula. Two Romance languages are widely spoken and official in Galicia: the native Galician and, mainly because of language shift, Castilian.

Human resources

Human resources are the people who make up the workforce of an organization, business sector, or economy. "Human capital" is sometimes used synonymously with "human resources", although human capital typically refers to a narrower effect (i.e., the knowledge the individuals embody and economic growth). Likewise, other terms sometimes used include manpower, talent, labor, personnel, or simply people.

A human-resources department (HR department) of an organization performs human resource management, overseeing various aspects of employment, such as compliance with labor law and employment standards, administration of employee benefits, and some aspects of recruitment.

Jus soli

Jus soli (English: ; Latin pronunciation: [juːs ˈsɔ.liː]), meaning "right of the soil", commonly referred to as birthright citizenship in the United States, is the right of anyone born in the territory of a state to nationality or citizenship.Jus soli was part of the English common law, in contrast to jus sanguinis, which derives from the Roman law that influenced the civil-law systems of continental Europe. Jus soli is the predominant rule in the Americas, but it is rare elsewhere. Since the Twenty-seventh Amendment of the Constitution of Ireland was enacted in 2004, no European country grants citizenship based on unconditional or near-unconditional jus soli.Almost all states in Europe, Asia, Africa and Oceania grant citizenship at birth based upon the principle of jus sanguinis (right of blood), in which citizenship is inherited through parents rather than birthplace, or a restricted version of jus soli in which citizenship by birthplace is automatic only for the children of certain immigrants.

Jus soli in many cases helps prevent statelessness. Countries that have acceded to the 1961 Convention on the Reduction of Statelessness are obligated to grant nationality to persons born in their territory who would otherwise become stateless persons. The American Convention on Human Rights similarly provides that "Every person has the right to the nationality of the state in whose territory he was born if he does not have the right to any other nationality."

Morse code

Morse code is a character encoding scheme used in telecommunication that encodes text characters as standardized sequences of two different signal durations called dots and dashes or dits and dahs. Morse code is named for Samuel F. B. Morse, an inventor of the telegraph.

The International Morse Code encodes the ISO basic Latin alphabet, some extra Latin letters, the Arabic numerals and a small set of punctuation and procedural signals (prosigns). Each Morse code symbol is formed by a sequence of dots and dashes. The dot duration is the basic unit of time measurement in Morse code transmission. The duration of a dash is three times the duration of a dot. Each dot or dash within a character is followed by period of signal absence, called a space, equal to the dot duration. The letters of a word are separated by a space of duration equal to three dots, and the words are separated by a space equal to seven dots. To increase the efficiency of encoding, Morse code was designed so that the length of each symbol is approximately inverse to the frequency of occurrence in text of the English language character that it represents. Thus the most common letter in English, the letter "E", has the shortest code: a single dot. Because the Morse code elements are specified by proportion rather than specific time durations, the code is usually transmitted at the highest rate that the receiver is capable of decoding. The Morse code transmission rate (speed) is specified in groups per minute, commonly referred to as words per minute.Morse code is usually transmitted by on-off keying of an information carrying medium such as electric current, radio waves, visible light or sound waves. The current or wave is present during time period of the dot or dash and absent during the time between dots and dashes.Morse code can be memorized, and Morse code signalling in a form perceptible to the human senses, such as sound waves or visible light, can be directly interpreted by persons trained in the skill.Because many non-English natural languages use other than the 26 Roman letters, Morse alphabets have been developed for those languages.

In an emergency, Morse code can be generated by improvised methods such as turning a light on and off, tapping on an object or sounding a horn or whistle, making it one of the simplest and most versatile methods of telecommunication. The most common distress signal is SOS – three dots, three dashes, and three dots – internationally recognized by treaty.


The Portable Document Format (PDF) is a file format developed by Adobe in the 1990s to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems. Based on the PostScript language, each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, vector graphics, raster images and other information needed to display it. PDF was standardized as an open format, ISO 32000, in 2008, and no longer requires any royalties for its implementation.Today, PDF files may contain a variety of content besides flat text and graphics including logical structuring elements, interactive elements such as annotations and form-fields, layers, rich media (including video content) and three dimensional objects using U3D or PRC, and various other data formats. The PDF specification also provides for encryption and digital signatures, file attachments and metadata to enable workflows requiring these features.

Relational database management system

A relational database management system (RDBMS) is a database management system (DBMS) based on the relational model of data. Most databases in widespread use today are based on this model.RDBMSs have been a common option for the storage of information in databases used for financial records, manufacturing and logistical information, personnel data, and other applications since the 1980s. Relational databases have often replaced legacy hierarchical databases and network databases because they were easier to implement and administer. Nonetheless, relational databases received continued, unsuccessful challenges by object database management systems in the 1980s and 1990s, (which were introduced in an attempt to address the so-called object-relational impedance mismatch between relational databases and object-oriented application programs), as well as by XML database management systems in the 1990s. However, due to the expanse of technologies, such as horizontal scaling of computer clusters, NoSQL databases have recently become popular as an alternative to RDBMS databases.


Science (from the Latin word scientia, meaning "knowledge") is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe.The earliest roots of science can be traced to Ancient Egypt and Mesopotamia in around 3500 to 3000 BCE. Their contributions to mathematics, astronomy, and medicine entered and shaped Greek natural philosophy of classical antiquity, whereby formal attempts were made to explain events of the physical world based on natural causes. After the fall of the Western Roman Empire, knowledge of Greek conceptions of the world deteriorated in Western Europe during the early centuries (400 to 1000 CE) of the Middle Ages but was preserved in the Muslim world during the Islamic Golden Age. The recovery and assimilation of Greek works and Islamic inquiries into Western Europe from the 10th to 13th century revived natural philosophy, which was later transformed by the Scientific Revolution that began in the 16th century as new ideas and discoveries departed from previous Greek conceptions and traditions. The scientific method soon played a greater role in knowledge creation and it was not until the 19th century that many of the institutional and professional features of science began to take shape.Modern science is typically divided into three major branches that consist of the natural sciences (e.g., biology, chemistry, and physics), which study nature in the broadest sense; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences (e.g., logic, mathematics, and theoretical computer science), which study abstract concepts. There is disagreement, however, on whether the formal sciences actually constitute a science as they do not rely on empirical evidence. Disciplines that use existing scientific knowledge for practical purposes, such as engineering and medicine, are described as applied sciences.Science is based on research, which is commonly conducted in academic and research institutions as well as in government agencies and companies. The practical impact of scientific research has led to the emergence of science policies that seek to influence the scientific enterprise by prioritizing the development of commercial products, armaments, health care, and environmental protection.


A scientist is someone who conducts scientific research to advance knowledge in an area of interest.In classical antiquity, there was no real ancient analog of a modern scientist. Instead, philosophers engaged in the philosophical study of nature called natural philosophy, a precursor of natural science. It was not until the 19th century that the term scientist came into regular use after it was coined by the theologian, philosopher, and historian of science William Whewell in 1833. The term 'scientist' was first coined by him for Mary Somerville, partly because the term "man of science", more custom at that time, was clearly inappropriate here.In modern times, many scientists have advanced degrees in an area of science and pursue careers in various sectors of the economy such as academia, industry, government, and nonprofit environments.

Semaphore (programming)

In computer science, a semaphore is a variable or abstract data type used to control access to a common resource by multiple processes in a concurrent system such as a multitasking operating system. A semaphore is simply a variable. This variable is used to solve critical section problems and to achieve process synchronization in the multi processing environment. A trivial semaphore is a plain variable that is changed (for example, incremented or decremented, or toggled) depending on programmer-defined conditions.

A useful way to think of a semaphore as used in the real-world system is as a record of how many units of a particular resource are available, coupled with operations to adjust that record safely (i.e. to avoid race conditions) as units are required or become free, and, if necessary, wait until a unit of the resource becomes available.

Semaphores are a useful tool in the prevention of race conditions; however, their use is by no means a guarantee that a program is free from these problems. Semaphores which allow an arbitrary resource count are called counting semaphores, while semaphores which are restricted to the values 0 and 1 (or locked/unlocked, unavailable/available) are called binary semaphores and are used to implement locks.

The semaphore concept was invented by Dutch computer scientist Edsger Dijkstra in 1962 or 1963, when Dijkstra and his team were developing an operating system for the Electrologica X8. That system eventually became known as THE multiprogramming system.

Traces of Catastrophe

Traces of Catastrophe: A Handbook of Shock-Metamorphic Effects in Terrestrial Meteorite Impact Structures is a book written by Bevan M. French of the Smithsonian Institution. It is a comprehensive technical reference on the science of impact craters. It was published in 1998 by the Lunar and Planetary Institute (LPI), which is part of the Universities Space Research Association (USRA). It was originally available in hard copy from LPI, but is now only available as a portable document format (PDF) e-book free download.The book has become very influential in the field of impact crater research, appearing as a common reference for papers and web sites on the topic. The Earth Impact Database lists it among the suggested reading on its introductory page about impact craters. The Impact Field Studies Group Impact Database says it is required reading before submitting an observation of a proposed impact site. NASA's Goddard Space Flight Center (GSFC) lists it among general references relevant to Planetary Science across the solar system. NASA GSFC also has a Remote Sensing Tutorial site which calls Traces of Catastrophe an "exceptional summary of impact cratering."


Tramadol, sold under the brand name Ultram among others, is an opioid pain medication used to treat moderate to moderately severe pain. When taken by mouth in an immediate-release formulation, the onset of pain relief usually begins within an hour. It is also available by injection. It may be sold in combination with paracetamol (acetaminophen) or as longer-acting formulations.Common side effects include constipation, itchiness, and nausea. Serious side effects may include seizures, increased risk of serotonin syndrome, decreased alertness, and drug addiction. A change in dosage may be recommended in those with kidney or liver problems. It is not recommended in those who are at risk of suicide or in those who are pregnant. While not recommended in women who are breastfeeding, those who take a single dose should not generally stop breastfeeding.Tramadol acts by binding to μ-opioid receptors on neurons. It is also a serotonin–norepinephrine reuptake inhibitor (SNRI). It is converted in the liver to O-desmethyltramadol, an opioid with stronger binding to the μ-opioid receptor.Tramadol was patented in 1963 and launched under the name "Tramal" in 1977 by the West German pharmaceutical company Grünenthal GmbH. In the mid-1990s, it was approved in the United Kingdom and the United States. It is available as a generic medication and marketed under many brand names worldwide. In the United States, the wholesale cost is less than US$0.05 per dose as of 2018. In 2016, it was the 39th most prescribed medication in the United States, with more than 19 million prescriptions.

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