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106-479: The Perseus Digital Library was created to provide access to materials of the history of humanity to everyone, with Gregory Crane, the editor-in-chief of the library, stating that "access to the cultural heritage of humanity is a right, not a privilege". This notably means that the Perseus Digital Library tries not to be exclusive to academics but aims to be accessible to everyone. To reflect this,

212-479: A backronym : Practical Extraction and Report Language and Wall's own Pathologically Eclectic Rubbish Lister , which is in the manual page for perl. Programming Perl , published by O'Reilly Media , features a picture of a dromedary camel on the cover and is commonly called the "Camel Book". This image has become an unofficial symbol of Perl. O'Reilly owns the image as a trademark but licenses it for non-commercial use, requiring only an acknowledgement and

318-573: A glue language and its perceived inelegance. Perl was originally named "Pearl". Wall wanted to give the language a short name with positive connotations. It is also a Christian reference to the Parable of the Pearl from the Gospel of Matthew. However, Wall discovered the existing PEARL language before Perl's official release and dropped the "a" from the name. The name is occasionally expanded as

424-473: A switch statement (called "given"/"when"), regular expressions updates, and the smart match operator (~~). Around this same time, development began in earnest on another implementation of Perl 6 known as Rakudo Perl, developed in tandem with the Parrot virtual machine . As of November 2009, Rakudo Perl has had regular monthly releases and now is the most complete implementation of Perl 6. A major change in

530-534: A visual pun on pearl onion . Larry Wall began work on Perl in 1987, while employed as a programmer at Unisys ; he released version 1.0 on December 18, 1987. Wall based early Perl on some methods existing languages used for text manipulation. Perl 2, released in June 1988, featured a better regular expression engine. Perl 3, released in October 1989, added support for binary data streams. Originally,

636-774: A Creative Commons License. The source code got subsequently released in 2007. Perseus has nowadays branched into other projects: the Scaife Viewer, which is the first phase of the work towards Perseus 5.0, the Perseus Catalog, which provides links to the digital editions not hosted by the Perseus Library, the Perseids Project, which aims to support access to Classics scholarship by providing tools to foster language acquisition, facilitate working with documents, and encourage research, and, more recently,

742-449: A badge indicating that they are "approved for free cultural works". Repositories exist which exclusively feature free material and provide content such as photographs, clip art , music, and literature. While extensive reuse of free content from one website in another website is legal, it is usually not sensible because of the duplicate content problem. Misplaced Pages is amongst the most well-known databases of user-uploaded free content on

848-482: A base object from which all classes were automatically derived and the ability to require versions of modules. Another significant development was the inclusion of the CGI.pm module, which contributed to Perl's popularity as a CGI scripting language . Perl 5.004 added support for Microsoft Windows , Plan 9 , QNX , and AmigaOS . Perl 5.005 was released on July 22, 1998. This release included several enhancements to

954-508: A case for a major new language initiative. This led to a decision to begin work on a redesign of the language, to be called Perl 6. Proposals for new language features were solicited from the Perl community at large, which submitted more than 300 RFCs . Wall spent the next few years digesting the RFCs and synthesizing them into a coherent framework for Perl 6. He presented his design for Perl 6 in

1060-402: A copyright holder's power to license their work, as copyleft which also utilizes copyright for such a purpose. The public domain is a range of creative works whose copyright has expired or was never established, as well as ideas and facts which are ineligible for copyright. A public domain work is a work whose author has either relinquished to the public or no longer can claim control over,

1166-513: A definition would exclude the Open Content License because that license forbids charging for content; a right required by free and open-source software licenses. It has since come to describe a broader class of content without conventional copyright restrictions. The openness of content can be assessed under the '5Rs Framework' based on the extent to which it can be retained, reused, revised, remixed and redistributed by members of

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1272-465: A dictionary entry, a morphological analysis tool known as Morpheus, a word frequency tool, and other texts where the word is used. Since the mark-up is automatically generated, older sections of the libraries have been noted to be less rich and complete than newer ones. This structure allows for a machine-readable and searchable environment, and one of Perseus' goals is the automated generation of knowledge through text and data mining . Each section of

1378-409: A free way of obtaining higher education that is "focused on collective knowledge and the sharing and reuse of learning and scholarly content." There are multiple projects and organizations that promote learning through open content, including OpenCourseWare and Khan Academy . Some universities, like MIT , Yale , and Tufts are making their courses freely available on the internet. There are also

1484-485: A full-text retrieval tool on Ancient Greek materials made by Gregory Crane, who became the editor-in-chief of the project ever since it was created. The goal of the library was to provide a wider access to knowledge, past the academical field; to quote the mission statement, "to make a full record of humanity, as intellectually accessible as possible, to every human being, regardless of linguistic or cultural background". The planning period took place from 1985 to 1988, with

1590-401: A link to www.perl.com. Licensing for commercial use is decided on a case-by-case basis. O'Reilly also provides "Programming Republic of Perl" logos for non-commercial sites and "Powered by Perl" buttons for any site that uses Perl. The Perl Foundation owns an alternative symbol, an onion, which it licenses to its subsidiaries, Perl Mongers , PerlMonks , Perl.org, and others. The symbol is

1696-475: A new I/O implementation, added a new thread implementation, improved numeric accuracy, and added several new modules. As of 2013, this version was still the most popular Perl version and was used by Red Hat Linux 5, SUSE Linux 10, Solaris 10, HP-UX 11.31, and AIX 5. In 2004, work began on the "Synopses" – documents that originally summarized the Apocalypses, but which became the specification for

1802-618: A number of organizations promoting the creation of openly licensed textbooks such as the University of Minnesota's Open Textbook Library, Connexions , OpenStax College , the Saylor Academy, Open Textbook Challenge, and Wikibooks . Any country has its own law and legal system, sustained by its legislation, which consists of documents. In a democratic country , laws are published as open content, in principle free content; but in general, there are no explicit licenses attributed for

1908-574: A rand() function using a consistent random number generator. Some observers credit the release of Perl 5.10 with the start of the Modern Perl movement. In particular, this phrase describes a style of development that embraces the use of the CPAN, takes advantage of recent developments in the language, and is rigorous about creating high quality code. While the book Modern Perl may be the most visible standard-bearer of this idea, other groups such as

2014-553: A result, Classics scholars have insisted that the commentaries and translations provided by Perseus cannot be used in an academical setting due to their age and the existence of more recent editions for the most often researched texts. Although the classical section is the most complete and established of the website, the Perseus Digital Library is not limited to this collection, and has branched throughout its existence into other categories of knowledge. Materials on early modern English literature are as such available, and used to be called

2120-700: A search bar on the website, as well as articles which presented information on Heracles and the Olympic Games, which were quite successful. In 1999, a grant from the Digital Library Initiative Phase 2 allowed Perseus to expand into other areas of Humanities and to create collections on the History of London and the American Civil War . Perseus 3.0 released in 2000 directly on the web. This version expanded and revised

2226-580: A series of documents called "apocalypses" – numbered to correspond to chapters in Programming Perl . As of January 2011 , the developing specification of Perl 6 was encapsulated in design documents called Synopses – numbered to correspond to Apocalypses. Thesis work by Bradley M. Kuhn , overseen by Wall, considered the possible use of the Java virtual machine as a runtime for Perl. Kuhn's thesis showed this approach to be problematic. In 2001, it

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2332-428: A text and item is also given a stable identifier of 10 digits, which makes citations possible in the form of four different URIs (text, citation, work, catalog record) containing URNs ; furthermore, metadata schemes are employed as to make each section or object meaningful outside of the context of the library. Those sections are also given a Creative Commons license indicating conditions of use. However, one should note

2438-531: A variety of documents on the study of Germanic people , such as Beowulf and a variety of sagas in Old Norse along with translations. This sub-section has been described as fairly good, considering that this field of research is less well researched than the other. Finally, the Perseus Digital Library hosts Arabic materials, but its selection is limited to the Quran and dictionaries. The Library used to host

2544-476: A work. The aim of copyleft is to use the legal framework of copyright to enable non-author parties to be able to reuse and, in many licensing schemes, modify content that is created by an author. Unlike works in the public domain, the author still maintains copyright over the material, however, the author has granted a non-exclusive license to any person to distribute, and often modify, the work. Copyleft licenses require that any derivative works be distributed under

2650-516: Is "Easy things should be easy and hard things should be possible". The design of Perl can be understood as a response to three broad trends in the computer industry: falling hardware costs, rising labor costs, and improvements in compiler technology. Many earlier computer languages, such as Fortran and C, aimed to make efficient use of expensive computer hardware. In contrast, Perl was designed so that computer programmers could write programs more quickly and easily. Perl has many features that ease

2756-430: Is any kind of creative work, such as a work of art , a book, a software program , or any other creative content for which there are very minimal copyright and other legal limitations on usage, modification and distribution. These are works or expressions which can be freely studied, applied, copied and modified by anyone for any purpose including, in some cases, commercial purposes. Free content encompasses all works in

2862-741: Is described as synonymous to the definitions of open/free in the Open Source Definition, the Free Software Definition, and the Definition of Free Cultural Works. A distinct difference is the focus given to the public domain, open access , and readable open formats . OKF recommends six conformant licenses: three of OKN's (Open Data Commons Public Domain Dedication and Licence, Open Data Commons Attribution License, Open Data Commons Open Database License ) and

2968-522: Is distributed via Internet to the general public. Publication of such resources may be either by a formal institution-wide program, or informally, by individual academics or departments. Open content publication has been seen as a method of reducing costs associated with information retrieval in research, as universities typically pay to subscribe for access to content that is published through traditional means. Subscriptions for non-free content journals may be expensive for universities to purchase, though

3074-676: Is not authorized, in order to protect items subject to intellectual property, the library offers download packages to the public. The Perseus Digital library also adheres to sets of standards edified by other projects. It follows the norms of the Text Encoding Initiative for its XML mark-up. In the same vein, the library has applied the Canonical Text Services (CTS) protocol regarding citations to its classical Greek-Latin corpus. Following this philosophy, Perseus chooses to use copyright -free texts, be it in

3180-975: Is used by the Wikimedia Foundation . In 2009, the Attribution and Attribution-ShareAlike Creative Commons licenses were marked as "Approved for Free Cultural Works". Another successor project is the Open Knowledge Foundation , founded by Rufus Pollock in Cambridge , in 2004 as a global non-profit network to promote and share open content and data. In 2007 the OKF gave an Open Knowledge Definition for "content such as music, films, books; data be it scientific, historical, geographic or otherwise; government and other administrative information". In October 2014 with version 2.0 Open Works and Open Licenses were defined and "open"

3286-515: Is used for system administration , network programming , finance, bioinformatics , and other applications, such as for graphical user interfaces (GUIs). It has been nicknamed "the Swiss Army chainsaw of scripting languages" because of its flexibility and power. In 1998, it was also referred to as the " duct tape that holds the Internet together", in reference to both its ubiquitous use as

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3392-436: Is very similar to open content . An analogy is a use of the rival terms free software and open-source, which describe ideological differences rather than legal ones. The term Open Source, by contrast, sought to encompass them all in one movement. For instance, the Open Knowledge Foundation 's Open Definition describes "open" as synonymous with the definition of free in the "Definition of Free Cultural Works" (as also in

3498-575: The CC BY , CC BY-SA , and CC0 Creative Commons licenses. Perl Perl is a high-level , general-purpose , interpreted , dynamic programming language . Though Perl is not officially an acronym, there are various backronyms in use, including "Practical Extraction and Reporting Language". Perl was developed by Larry Wall in 1987 as a general-purpose Unix scripting language to make report processing easier. Since then, it has undergone many changes and revisions. Perl originally

3604-539: The Alpheios Project , Alison Babeu, Digital Librarian and Research Coordinator of the library since 2004, Lisa Cerrato, Managing Editor who was a part of Perseus since 1994, and Anna Krohn, digital library analyst and lead developer of the Perseus Catalog. Frederik Baumgardt and Tim Buckingham are also noted as working on the Perseids Project full time, respectively as Data Architect and Senior Research Coordinator. A list of former staff and students can be found on

3710-553: The Comprehensive Perl Archive Network (CPAN) was established as a repository for the Perl language and Perl modules ; as of December 2022 , it carries over 211,850 modules in 43,865 distributions, written by more than 14,324 authors, and is mirrored worldwide at more than 245 locations. Perl 5.004 was released on May 15, 1997, and included, among other things, the UNIVERSAL package, giving Perl

3816-604: The Libera Chat #raku IRC channel. Many functional programming influences were absorbed by the Perl 6 design team. In 2012, Perl 6 development was centered primarily on two compilers: In 2013, MoarVM ("Metamodel On A Runtime"), a C language-based virtual machine designed primarily for Rakudo was announced. In October 2019, Perl 6 was renamed to Raku. As of 2017 only the Rakudo implementation and MoarVM are under active development, and other virtual machines, such as

3922-804: The Library of Congress archival collections related to the cultural heritage of the United States, were harvested in order to offer a collection on the history of the 19th-century United States. This third-party collection was further completed by materials on the American Civil War . This sub-collection, as well as materials on the Humanist and Renaissance Italian Poetry in Latin and the Richmond Times Dispatch , are regarded as fairly complete due to their narrow subject. Perseus also hosts

4028-566: The Open Content Project , describing works licensed under the Open Content License (a non-free share-alike license, see 'Free content' below) and other works licensed under similar terms. The website of the Open Content Project once defined open content as 'freely available for modification, use and redistribution under a license similar to those used by the open-source / free software community'. However, such

4134-537: The Open Source Definition and Free Software Definition ). For such free/open content both movements recommend the same three Creative Commons licenses , the CC BY, CC BY-SA, and CC0. Copyright is a legal concept, which gives the author or creator of a work legal control over the duplication and public performance of their work. In many jurisdictions, this is limited by a time period after which

4240-753: The Section 508 Amendment to the Rehabilitation Act of 1973 . Perseus has proven convincing in terms of sustainability throughout its long history and ability to evolve, having notably been able to migrate from the SGML format to XML in Perseus 4.0. The preservation of the collections is further insured by a Fedora Commons Backend created in 2002 as well as a mirror site provided by the University of Chicago. The Perseus Digital Library has been under

4346-473: The public domain and also those copyrighted works whose licenses honor and uphold the definition of free cultural work. In most countries, the Berne Convention grants copyright holders control over their creations by default. Therefore, copyrighted content must be explicitly declared free by the authors, which is usually accomplished by referencing or including licensing statements from within

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4452-471: The regex engine, new hooks into the backend through the B::* modules, the qr// regex quote operator, a large selection of other new core modules, and added support for several more operating systems, including BeOS . Perl 5.6 was released on March 22, 2000. Major changes included 64-bit support, Unicode string representation, support for files over 2 GiB, and the "our" keyword. When developing Perl 5.6,

4558-560: The yada yada operator (intended to mark placeholder code that is not yet implemented), implicit strictures, full Y2038 compliance, regex conversion overloading, DTrace support, and Unicode 5.2. On May 14, 2011, Perl 5.14 was released with JSON support built-in. On May 20, 2012, Perl 5.16 was released. Notable new features include the ability to specify a given version of Perl that one wishes to emulate, allowing users to upgrade their version of Perl, but still run old scripts that would normally be incompatible. Perl 5.16 also updates

4664-454: The "Apocalypses" for Perl 6, a series of documents meant to summarize the change requests and present the design of the next generation of Perl. They were presented as a digest of the RFCs, rather than a formal document. At this time, Perl 6 existed only as a description of a language. Perl 5.8 was first released on July 18, 2002, and further 5.X versions have been released approximately yearly since then. Perl 5.8 improved Unicode support, added

4770-1247: The Berger Family Technology Transfer Endowment, the Digital Libraries Initiative Phase 2, the Fund for the Improvement of Postsecondary Education part of the U.S. Department of Education, the Getty Grant program, the Modern Language Association , the National Endowment for the Arts, the National Science Foundation , the Packard Humanities Institute , Xerox , Boston University , and Harvard University. Open-source content Free content , libre content , libre information , or free information

4876-614: The Beyond Translation project, which aims to combine the Scaife Viewer with new versions and services of Perseus 4.0. Furthermore, the library has been cooperating internationally with Leipzig University , with several projects emerging of it, such as the Ancient Greek and Latin Dependency Treebank, for classical philology, Leipzig Open Fragmentary Texts Series (LOFTS) which focuses on fragmentary texts,

4982-641: The Bolles Collection of the History of London , a digitized recreation of an existing special collection homogeneous in theme but heterogeneous in content, which interlinks maps of London, relevant texts, and historical and contemporary illustrations of the city. The collection got transferred to the Tufts Digital Library . The same can be said of the Duke Databank of Documentary Papyri and the history of Tufts, which used to be on

5088-690: The Enlightened Perl Organization have taken up the cause. In late 2012 and 2013, several projects for alternative implementations for Perl 5 started: Perl5 in Perl6 by the Rakudo Perl team, moe by Stevan Little and friends, p2 by the Perl11 team under Reini Urban, gperl by goccy, and rperl, a Kickstarter project led by Will Braswell and affiliated with the Perl11 project. At the 2000 Perl Conference , Jon Orwant made

5194-552: The Humanities as well as private donors, and Tufts University. The Mellon Foundation, Tufts University, Harvard University 's Center for Hellenic Studies and, mainly, the National Endowment for the Humanities are specifically noted as key donors that made the Beyond Translation project possible. Additional support for the Perseus project has been provided over the years by the Annenberg Foundation , Apple Inc. ,

5300-674: The Java Virtual Machine and JavaScript , are supported. In June 2020, Perl 7 was announced as the successor to Perl 5. Perl 7 was to initially be based on Perl 5.32 with a release expected in first half of 2021, and release candidates sooner. This plan was revised in May 2021, without any release timeframe or version of Perl 5 for use as a baseline specified. When Perl 7 would be released, Perl 5 would have gone into long term maintenance. Supported Perl 5 versions however would continue to get important security and bug fixes. Perl 7

5406-615: The Open Greek and Latin Project and Open Persian. The Perseus Digital Library contains online collections on the Humanities pertaining to different subjects. The main collection focuses on the classical materials of ancient Greece and ancient Rome, and features an extensive number of texts written in Ancient Greek and Latin chosen for their status as a canonical literary text, in a degree of completeness and representativeness no other digital library can claim. It has however been noted that

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5512-498: The Perl 6 language. In February 2005, Audrey Tang began work on Pugs , a Perl 6 interpreter written in Haskell . This was the first concerted effort toward making Perl 6 a reality. This effort stalled in 2006. The Perl On New Internal Engine (PONIE) project existed from 2003 until 2006. It was to be a bridge between Perl 5 and 6, and an effort to rewrite the Perl 5 interpreter to run on the Perl 6 Parrot virtual machine . The goal

5618-629: The Perl Steering Committee canceled it to avoid issues with backward compatibility for scripts that were not written to the pragmas and modules that would become the default in Perl 7. Perl 7 will only come out when the developers add enough features to warrant a major release upgrade. According to Wall, Perl has two slogans. The first is "There's more than one way to do it," commonly known as TMTOWTDI, (pronounced Tim Toady ). As proponents of this motto argue, this philosophy makes it easy to write concise statements. The second slogan

5724-678: The Perseus Garner. They consisted of a heterogeneous compilation of primary materials from the early modern period in England, as well as selected secondary materials from the nineteenth and early twentieth centuries, comprising the works of Christopher Marlowe , the Globe Shakespeare, volumes from the New Variorum Shakespeare Series, Raphael Holinshed's Chronicles, Richard Hakluyt's Voyages and

5830-549: The Perseus Library switched to a website version in 1995 written in Perl . Thanks to this new interface, Perseus-Online could reach a wider audience. However, Perseus was still bound by copyright agreements made with the CD-ROM company, which limited the reuse of material. Perseus 2.0 Online expanded the collection in 1997, adding Roman materials as well as Renaissance texts of Shakespeare and Marlowe . This version also introduced

5936-654: The Perseus website. A long list of agencies provided funding and grants to the Perseus Digital Library over the years. According to the home page of the Perseus website, the list of recent financial supporters includes: the Alpheios Project , the Andrew W. Mellon Foundation , the United States Department of Education , the Institute of Museum and Library Services , the National Endowment for

6042-581: The US National Institutes of Health , Research Councils UK (effective 2016) and the European Union (effective 2020). At an institutional level, some universities, such as the Massachusetts Institute of Technology , have adopted open access publishing by default by introducing their own mandates. Some mandates may permit delayed publication and may charge researchers for open access publishing. For teaching purposes, some universities, including MIT , provide freely available course content, such as lecture notes, video resources and tutorials. This content

6148-405: The arbitrary data-length limits of many contemporary Unix command line tools . Perl is a highly expressive programming language: source code for a given algorithm can be short and highly compressible. Perl gained widespread popularity in the mid-1990s as a CGI scripting language, in part due to its powerful regular expression and string parsing abilities. In addition to CGI, Perl 5

6254-400: The articles are written and peer-reviewed by academics themselves at no cost to the publisher. This has led to disputes between publishers and some universities over subscription costs, such as the one that occurred between the University of California and the Nature Publishing Group . Free and open content has been used to develop alternative routes towards higher education. Open content is

6360-567: The automotive industry, and even agricultural areas. Technologies such as distributed manufacturing can allow computer-aided manufacturing and computer-aided design techniques to be able to develop small-scale production of components for the development of new, or repair of existing, devices. Rapid fabrication technologies underpin these developments, which allow end-users of technology to be able to construct devices from pre-existing blueprints, using software and manufacturing hardware to convert information into physical objects. In academic work,

6466-408: The consistent leadership of its founder and editor in chief Gregory Crane. The library is nowadays located at Tufts University with a full-time staff of eight members, consisting of Gregory Crane, Marie-Claire Beaulieu, who has joined the project in 2010 and become its Associate Editor in 2013, Bridget Almas, lead software developer of the Perseus Digital Library and one of the primary programmers of

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6572-410: The core to support Unicode 6.1. On May 18, 2013, Perl 5.18 was released. Notable new features include the new dtrace hooks, lexical subs, more CORE:: subs, overhaul of the hash for security reasons, support for Unicode 6.2. On May 27, 2014, Perl 5.20 was released. Notable new features include subroutine signatures, hash slices/new slice syntax, postfix dereferencing (experimental), Unicode 6.3, and

6678-555: The cost of publication and reduced the entry barrier sufficiently to allow for the production of widely disseminated materials by individuals or small groups. Projects to provide free literature and multimedia content have become increasingly prominent owing to the ease of dissemination of materials that are associated with the development of computer technology. Such dissemination may have been too costly prior to these technological developments. In media, which includes textual, audio, and visual content, free licensing schemes such as some of

6784-495: The decision was made to switch the versioning scheme to one more similar to other open source projects; after 5.005_63, the next version became 5.5.640, with plans for development versions to have odd numbers and stable versions to have even numbers. In 2000, Wall put forth a call for suggestions for a new version of Perl from the community. The process resulted in 361 RFC ( Request for Comments ) documents that were to be used in guiding development of Perl 6. In 2001, work began on

6890-484: The development of the Ancient Greek collection starting in 1987 thanks to funding from the Annenberg-CPB Project which allowed the Perseus Project to be developed. Perseus 1.0, or HyperCard Perseus, was a CD-ROM released in 1992 by Yale University , using the Apple HyperCard for McIntosh . For practical reasons, it was limited to ancient Greek materials, and contained the texts of nine major Greek authors along with an English translation and commentary. The collection

6996-399: The development process of Perl 5 occurred with Perl 5.11; the development community has switched to a monthly release cycle of development releases, with a yearly schedule of stable releases. By that plan, bugfix point releases will follow the stable releases every three months. On April 12, 2010, Perl 5.12.0 was released. Notable core enhancements include new package NAME VERSION syntax,

7102-413: The distribution and usage of the work. As such, any person may manipulate, distribute, or otherwise use the work, without legal ramifications. A work in the public domain or released under a permissive license may be referred to as "copycenter". Copyleft is a play on the word copyright and describes the practice of using copyright law to remove restrictions on distributing copies and modified versions of

7208-409: The holders of the rights to that material. This is notably the case for the pictures of artifacts that come from partnership with museums. The Perseus Library is one of the first digital libraries to have been created, and is widely regarded as a pioneer in the field and a role model of other similar initiatives. The Perseus Library first originated as a branch of the Thesaurus Linguae Graecae , from

7314-406: The lack of a TEI-header containing bibliographical information and metadata about the respective source, and that such information needs to be searched for on the Perseus Catalog. As a result of the use of this technology, Perseus has been useful to scholars of classical philology and history in facilitating the study of the material, but also to students who have benefited from the various tools

7420-420: The latter must be available for commercial use by the public. However, it is similar to several definitions for open educational resources, which include resources under noncommercial and verbatim licenses. In 2003, David Wiley announced that the Open Content Project had been succeeded by Creative Commons and their licenses; Wiley joined as "Director of Educational Licenses". In 2005, the Open Icecat project

7526-414: The library offers. The website has been criticised for being ergonomically poor and unintuitive, and new users may have problems accessing resources due to a confusing layout which seems to prioritize showcasing the Perseus Digital Library over its collections. The lack of presentation for collections accentuates this problem. Accessibility is another issue, with pages not always adhering to the standards of

7632-560: The library supports open-source content and has published its code on SourceForge . The website is written in Java , uses sustainable formats such as XML and JPEG , and includes native support for the Greek , Latin and Arabic alphabets. It allows users to download all materials that belong to the public domain along with the Creative Commons rights information that specify their conditions of use. While automated downloading

7738-404: The licenses made by Creative Commons have allowed for the dissemination of works under a clear set of legal permissions. Not all Creative Commons licenses are entirely free; their permissions may range from very liberal general redistribution and modification of the work to a more restrictive redistribution-only licensing. Since February 2008, Creative Commons licenses which are entirely free carry

7844-507: The main one is that published by a government gazette . So, law-documents can eventually inherit license expressed by the repository or by the gazette that contains it. The concept of applying free software licenses to content was introduced by Michael Stutz, who in 1997 wrote the paper "Applying Copyleft to Non-Software Information" for the GNU Project . The term "open content" was coined by David A. Wiley in 1998 and evangelized via

7950-826: The majority of works are not free, although the percentage of works that are open access is growing. Open access refers to online research outputs that are free of all restrictions to access and free of many restrictions on use (e.g. certain copyright and license restrictions). Authors may see open access publishing as a way of expanding the audience that is able to access their work to allow for greater impact, or support it for ideological reasons. Open access publishers such as PLOS and BioMed Central provide capacity for review and publishing of free works; such publications are currently more common in science than humanities. Various funding institutions and governing research bodies have mandated that academics must produce their works to be open-access, in order to qualify for funding, such as

8056-603: The materials that weren't included on account on not being traditionally studied are further devalued by the lack of representation. The library does not only host primary readings. Partnerships with museums allowed it to build a consequent collection of artifacts which showcases pictures of coins, sculptures, vases, but also gems, buildings and sites, as well as information concerning the context of artifact and its current location. Moreover, Perseus includes commentaries and translations that are free of copyright. However, to be free of copyright, texts have to be sufficiently old, and, as

8162-418: The now canonically accepted versions of ancient texts were established and sectioned later, during the 20th century. Perseus however tries to make rare and out-of-print materials accessible, and, for some texts, the material one can find on the website is the only one that was produced, which makes it especially valuable to scholars. Some content is restricted by intellectual property license agreements with

8268-639: The number of consumers. In some cases, free software vendors may use peer-to-peer technology as a method of dissemination. Project hosting and code distribution is not a problem for most free projects as a number of providers offer these services free of charge. Free content principles have been translated into fields such as engineering, where designs and engineering knowledge can be readily shared and duplicated, in order to reduce overheads associated with project development. Open design principles can be applied in engineering and technological applications, with projects in mobile telephony , small-scale manufacture,

8374-411: The only documentation for Perl was a single lengthy man page . In 1991, Programming Perl , known to many Perl programmers as the "Camel Book" because of its cover, was published and became the de facto reference for the language. At the same time, the Perl version number was bumped to 4, not to mark a major change in the language but to identify the version that was well documented by the book. Perl 4

8480-442: The original author, to maintain the original license of the reused content) or restrictions (excluding commercial use, banning certain media) chosen by the author. There are a number of standardized licenses offering varied options that allow authors to choose the type of reuse of their work that they wish to authorize or forbid. There are a number of different definitions of free content in regular use. Legally, however, free content

8586-403: The primary readings or in their translations and commentaries. For these reasons, the texts hosted necessarily date at the latest from the 19th and early 20th century, and must be divided into books, chapters and sections to be displayed individually. As such, those translations and commentaries can be outdated compared to the current state of the research, which can prove problematic when most of

8692-473: The public without violating copyright law. Unlike free content and content under open-source licenses , there is no clear threshold that a work must reach to qualify as 'open content'. The 5Rs are put forward on the Open Content Project website as a framework for assessing the extent to which content is open: This broader definition distinguishes open content from open-source software, since

8798-420: The rhetorical works of Henry Peacham and Thomas Wilson , among other primary sources. Several reference works, include glossaries and lexicons, are also included. This collection of texts has however been criticized for its choices of inclusion, and described as neither balanced nor complete, and texts not included are devalued by their absence. Records from American Memory , a corpus of electronic versions of

8904-507: The same terms and that the original copyright notices be maintained. A symbol commonly associated with copyleft is a reversal of the copyright symbol , facing the other way; the opening of the C points left rather than right. Unlike the copyright symbol, the copyleft symbol does not have a codified meaning. Projects that provide free content exist in several areas of interest, such as software, academic literature, general literature, music, images, video, and engineering . Technology has reduced

9010-529: The scope of the projects, which ultimately led to the CD-ROM versions of Perseus only covering Greek material. Moreover, they were very expensive: even though the price was to only make minimal profits, the CDs cost between $ 150 and $ 350 depending on the amount of material included, and were only released in North America, which severely limited worldwide accessibility. After moving to Tufts University in 1993,

9116-422: The social structures that result leading to decreased production costs. Given sufficient interest in a software component, by using peer-to-peer distribution methods, distribution costs may be reduced, easing the burden of infrastructure maintenance on developers. As distribution is simultaneously provided by consumers, these software distribution models are scalable; that is, the method is feasible regardless of

9222-655: The task of the programmer at the expense of greater CPU and memory requirements. These include automatic memory management; dynamic typing ; strings, lists, and hashes; regular expressions; introspection ; and an eval() function. Perl follows the theory of "no built-in limits", an idea similar to the Zero One Infinity rule. Wall was trained as a linguist, and the design of Perl is very much informed by linguistic principles. Examples include Huffman coding (common constructions should be short), good end-weighting (the important information should come first), and

9328-481: The text of each law, so the license must be assumed as an implied license . Only a few countries have explicit licenses in their law-documents, as the UK's Open Government Licence (a CC BY compatible license). In the other countries, the implied license comes from its proper rules (general laws and rules about copyright in government works). The automatic protection provided by the Berne Convention does not apply to

9434-411: The texts of laws: Article 2.4 excludes the official texts from the automatic protection. It is also possible to "inherit" the license from context. The set of country's law-documents is made available through national repositories. Examples of law-document open repositories: LexML Brazil , Legislation.gov.uk , and N-Lex . In general, a law-document is offered in more than one (open) official version, but

9540-456: The texts to additional materials. Interlinks exist between a primary reading, its different versions, and its translations and commentaries. Users can also find maps of places mentioned in the texts as well as a historical timeline, and search tools allow readers to look for a text by its author or the presence of a specific lemma or word. Perseus also enhanced its texts through TEI-compliant markup language , which allows each word to be linked to

9646-694: The web. While the vast majority of content on Misplaced Pages is free content, some copyrighted material is hosted under fair-use criteria . Free and open-source software , which is often referred to as open source software and free software , is a maturing technology with companies using them to provide services and technology to both end-users and technical consumers. The ease of dissemination increases modularity, which allows for smaller groups to contribute to projects as well as simplifying collaboration. Some claim that open source development models offer similar peer-recognition and collaborative benefit incentive as in more classical fields such as scientific research, with

9752-479: The website as well (Perseus). A section on the history of mechanics also used to be present on Perseus. The Perseus Library follows the goal of Digital Humanities , which is to capitalize on the use of modern technology to further research in Classics and facilitate understanding of the material. As such, it uses a variety of tools to enrich the texts it hosts. One of the way it does so is by automatically linking

9858-685: The website, adding new collections, but it was subject to some issues when it came to making links to material stable and consistent. The current version of Perseus, Perseus 4.0, also known as the Perseus Hopper, was released in 2005, with Perseus 3.0 coexisting alongside and slowly fading out, until it got taken down in 2009. This time, the website was based on Java , written in the open-sourced language Hopper and TEI-compliant XML. The shift allowed Perseus to produce its own XML-encoded texts, which were not bound by copyright agreements. The Greek, Latin and English collections were released in 2006 under

9964-445: The work of the author to those who either pay royalties to the author for usage of the author's content or limit their use to fair use. Secondly, it limits the use of content whose author cannot be found. Finally, it creates a perceived barrier between authors by limiting derivative works, such as mashups and collaborative content. Although open content has been described as a counterbalance to copyright , open content licenses rely on

10070-403: The work. The right to reuse such a work is granted by the authors in a license known as a free license , a free distribution license, or an open license, depending on the rights assigned. These freedoms given to users in the reuse of works (that is, the right to freely use, study, modify or distribute these works, possibly also for commercial purposes) are often associated with obligations (to cite

10176-406: The works then enter the public domain . Copyright laws are a balance between the rights of creators of intellectual and artistic works and the rights of others to build upon those works. During the time period of copyright the author's work may only be copied, modified, or publicly performed with the consent of the author, unless the use is a fair use . Traditional copyright control limits the use of

10282-466: Was announced on 24 June 2020 at "The Perl Conference in the Cloud" as the successor to Perl 5. Based on Perl 5.32, Perl 7 was planned to be backward compatible with modern Perl 5 code; Perl 5 code, without boilerplate (pragma) header needs adding use compat::perl5; to stay compatible, but modern code can drop some of the boilerplate. The plan to go to Perl 7 brought up more discussion, however, and

10388-508: Was decided that Perl 6 would run on a cross-language virtual machine called Parrot . In 2005, Audrey Tang created the Pugs project, an implementation of Perl 6 in Haskell . This acted as, and continues to act as, a test platform for the Perl 6 language (separate from the development of the actual implementation), allowing the language designers to explore. The Pugs project spawned an active Perl/Haskell cross-language community centered around

10494-400: Was enriched by use of hyperlink technology and contextual material such as pictures of artifacts, an atlas as well as an historical timeline, and an enclycopedia of places, people and terminology, in an attempt to help non-academic users gain access to the material. Perseus 1.0 got nonetheless criticized for its "difficulty of use and odd content, both specialised and lacking". Furthermore, it

10600-614: Was launched, in which product information for e-commerce applications was created and published under the Open Content License. It was embraced by the tech sector, which was already quite open source minded. In 2006, a Creative Commons' successor project, the Definition of Free Cultural Works , was introduced for free content. It was put forth by Erik Möller , Richard Stallman , Lawrence Lessig , Benjamin Mako Hill , Angela Beesley, and others. The Definition of Free Cultural Works

10706-399: Was not a true digital library, but rather more a CD-ROM of primary readings published with various additional information. A second version of the CD-ROM came in 1996 in the form of Perseus 2.0, which mainly expanded the collection of pictures. It was still limited to McIntosh computers, until a platform-independent version got released in 2000. Hardware limitations induced costs and limited

10812-548: Was not capitalized and the name was changed to being capitalized by the time Perl 4 was released. The latest release is Perl 5, first released in 1994. From 2000 to October 2019 a sixth version of Perl was in development; the sixth version's name was changed to Raku . Both languages continue to be developed independently by different development teams which liberally borrow ideas from each other. Perl borrows features from other programming languages including C , sh , AWK , and sed . It provides text processing facilities without

10918-496: Was released in March 1991. Perl 4 went through a series of maintenance releases , culminating in Perl 4.036 in 1993, whereupon Wall abandoned Perl 4 to begin work on Perl 5. Initial design of Perl 5 continued into 1994. The perl5-porters mailing list was established in May 1994 to coordinate work on porting Perl 5 to different platforms. It remains the primary forum for development, maintenance, and porting of Perl 5. Perl 5.000

11024-418: Was released on March 13, 1995. Perl 5.002 was released on February 29, 1996 with the new prototypes feature. This allowed module authors to make subroutines that behaved like Perl builtins . Perl 5.003 was released June 25, 1996, as a security release. One of the most important events in Perl 5 history took place outside of the language proper and was a consequence of its module support. On October 26, 1995,

11130-503: Was released on October 17, 1994. It was a nearly complete rewrite of the interpreter , and it added many new features to the language, including objects , references , lexical (my) variables , and modules . Importantly, modules provided a mechanism for extending the language without modifying the interpreter. This allowed the core interpreter to stabilize, even as it enabled ordinary Perl programmers to add new language features. Perl 5 has been in active development since then. Perl 5.001

11236-466: Was to ensure the future of the millions of lines of Perl 5 code at thousands of companies around the world. The PONIE project ended in 2006 and is no longer being actively developed. Some of the improvements made to the Perl 5 interpreter as part of PONIE were folded into that project. On December 18, 2007, the 20th anniversary of Perl 1.0, Perl 5.10.0 was released. Perl 5.10.0 included notable new features, which brought it closer to Perl 6. These included

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