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	Tuple relational calculus - Wikipedia, the free encyclopedia
		The tuple calculus is a calculus that was introduced by Edgar F. Codd as part of the relational model in order to give a declarative database query language for this data model.
		Along with the tuple calculus Codd also introduced the domain calculus which is closer to first-order logic and showed that these two calculi (and the relational algebra) are equivalent in expressive power.
		The subset of C for which a tuple t is defined is called the domain of t (not to be confused with the domain in the schema) and denoted as dom(t).
	en.wikipedia.org /wiki/Tuple_calculus (2012 words)

	Tuple - Wikipedia, the free encyclopedia
		In mathematics, a tuple is a finite sequence of objects, that is, a list of a limited number of objects.
		For example, a directed graph is defined as a tuple (V, E) where V is the set of nodes and E is a subset of V × V that denotes the edges.
		In some languages and especially in database theory, a tuple is usually defined as a finite function that maps field names to a certain value.
	en.wikipedia.org /wiki/Tuple (675 words)

	VisAD: Class Tuple
		Tuple is the general VisAD data class for vectors.
		Tuple objects are immutable in the sense that the sequence of
		Construct a Tuple object from an array of Data objects; this constructs its MathType from the MathTypes of the data array
	www.ssec.wisc.edu /~dglo/visad/visad/Tuple.html (622 words)

	tuple from FOLDOC (Site not responding. Last check: 2007-11-07)
		The implementation of tuples in a language may be either "lifted" or not.
		Thus in Haskell, pattern matching on tuples is the same as pattern matching on types with multiple constructors (algebraic data types) - the expression being matched is evaluated as far as the top level constructor, even though, in the case of tuples, there is only one possible constructor for a given type.
		If tuple constructor functions were strict in all their arguments then (bottom,x) = (x,bottom) = bottom for any x so matching a refutable pattern would fail to terminate if any component was bottom.
	foldoc.org /foldoc/foldoc.cgi?query=tuple (345 words)

	Tackle Common Programming Tasks Using the New <tuple> Library
		Tuples are fixed size collections of heterogeneous objects, and they are being added to the C++ standard.
		Tuple types are one of the recent additions to the standard.
		A tuple type is a specialization, or an instance, of the class template tuple.
	www.devx.com /cplus/10MinuteSolution/21712/1954?pf=true (928 words)

	PyLinda: About Linda
		All tuples in a tuplespace may be stored on a single node of the network, or they may be spread out over several nodes.
		As described in [1] tuplespaces are a generative communication method because when a tuple is added to a tuplespace by a process, A, then even if that process A dies the tuple remains in the tuplespace until it is requested by another process.
		is a tuple of size 2, with an integer as the first element, and a string as the second.
	www-users.cs.york.ac.uk /~aw/pylinda/about.html (2131 words)

	Harinarayan, V.; Gupta, A.: Optimization Using Tuple Subsumption.
		A tuple t 1 of relation R subsumes tuple t 2 of R, with respect to a query Q if for every database, tuple t 1 derives all, and possibly more, answers to query Q than derived by tuple t 2.
		Therefore, the subsumed tuple t 2 can be ignored with respect to Q in the presence of tuple t 1 in relation R. This property finds use in a large number of problems.
		For instance: during query optimization subsumed tuples can be ignored thereby avoiding the computation of redundant answers; the size of cached information in distributed and object oriented systems can be reduced by omitting subsumed tuples; constraints need not be checked and rules need not be recomputed when provably subsumed updates are made.
	dbpubs.stanford.edu:8090 /pub/1994-26 (360 words)

	Understanding the Lempel-Ziv Data Compression Algorithm in Java
		(Tuple is the name of a class that I used to encapsulate a three-element tuple containing three values that occur repeatedly in the LZ77 algorithm.
		This is accomplished by causing the contents of each tuple to point to the previous occurrence of a matching string of characters rather than to simply repeat the string of characters.
		Thus, the size of a tuple (consisting of a group of bits of a specified size) will always be larger than the number of bits required for a single character in the input message.
	www.developer.com /java/data/article.php/3586396 (9456 words)

	5. Data Structures
		As you see, on output tuples are always enclosed in parentheses, so that nested tuples are interpreted correctly; they may be input with or without surrounding parentheses, although often parentheses are necessary anyway (if the tuple is part of a larger expression).
		Empty tuples are constructed by an empty pair of parentheses; a tuple with one item is constructed by following a value with a comma (it is not sufficient to enclose a single value in parentheses).
		Tuples can be used as keys if they contain only strings, numbers, or tuples; if a tuple contains any mutable object either directly or indirectly, it cannot be used as a key.
	www.python.org /doc/current/tut/node7.html (2396 words)

	Tuple Spaces - Research - VerticalNet, Inc. (Site not responding. Last check: 2007-11-07)
		Tuple Spaces evolved from early Blackboard Architecture research within the field of AI [IBM].
		Tuple Space agents are said to be "decoupled" in that their processes communicate via messages distributed via a "space".
		Rather than simply removing a message from a tuple space, it may be more appropriate for an agent that wishes to act exclusively on the message to negotiate this with the sending agent.
	alumnus.caltech.edu /~croft/research/agent/tuplespaces (1844 words)

	T Spaces
		They augmented the standard tuple matching algorithm to allow a template and a tuple to match if the type of the tuple is an instance of the type of the template--in which case, the object in the tuple can implement the object in the template.
		For a tuple to match an object compatibility template (known as a Subclassable Tuple template), the type of the tuple in the space must be a subclass of the type of the template.
		These tuples are created in the transaction that created the event of interest, and thus, their creation will be atomic with the commit of the operation that is the event.
	www.research.ibm.com /journal/sj/373/wyckoff.html (10059 words)

	Chapter 9: Tuples (Site not responding. Last check: 2007-11-07)
		The left side is a tuple of variables; the right side is a tuple of values.
		Tuples can be used wherever an immutable type is required, such as a key in a dictionary.
		An assignment to all of the elements in a tuple using a single assignment statement.
	www.ibiblio.org /obp/thinkCSpy/chap09.htm (1705 words)

	Cover Pages: Tuple Spaces and XML Spaces
		The concept of tuple space has been reinterpreted in context of XML so that a tuple is an XML document with some aspects of the document used as tuple data and rest as payload.
		A tuple is just a list of values, whereas a tuple space contains these values in such a way they can be searched for with a template containing hints of the information an application may be trying to find.
		The tuple-space serves as an associative memory, in that tuples in the tuple-space can be accessed by matching some or all the elements of the tuples to values or types presented in a 'template', which is simply a tuple set up for this matching.
	xml.coverpages.org /tupleSpaces.html (5000 words)

	Tuples, routine objects and iterators
		The original form of this document was entitled Tuples, routine objects and iterators and covered important applications of tuples.
		is a tuple with two elements, the second one itself a tuple; the overall expression represents an instance of
		For a set of important applications of tuples see the book chapter on delayed calls and iterators which also covers aspects of numerical software and related topics following from the tuple mechanism.
	archive.eiffel.com /doc/manuals/language/tuples/page.html (753 words)

	4.5 Case Study: Tuple Space
		The insert operation provides a key and values for a new tuple's arguments, while the read and the read/delete operations specify the key and arity (number of arguments) of the tuple that is to be retrieved.
		tuples into tuple space, a technique known as a ``poison pill.'' Each worker repeatedly removes a search datum from tuple space, compares it with the target, and puts the resulting score back in tuple space.
		This strategy has the desirable property that no tuple space operation requires more than two communications: one to forward the request to the task in which the relevant tuple is located, and one to return a result.
	www-unix.mcs.anl.gov /dbpp/text/node44.html (890 words)

	Poetix » Blog Archive » Tuple Spaces in Python (Site not responding. Last check: 2007-11-07)
		Tuple spaces provide a co-ordination language that allow multiple processes to exchange information, synchronize with each other, maintain or service worklists and generally…co-ordinate their behaviour.
		My interest in tuple spaces was initially sparked by reading the discussion of dataflow variables in CTM, and thinking about how that approach to modelling concurrency could be applied in Python.
		Using tuple spaces for concurrency differs from a message-passing approach in that none of the tuples has an explicit recipient: any process that can access the space can read/remove any tuple in the space.
	codepoetics.com /poetix/index.php?p=29 (675 words)

	Define tuple - a definition from Whatis.com
		Common uses for the tuple as a data type are (1) for passing a string of parameters from one program to another, and (2) representing a set of value attributes in a relational database.
		2) A tuple is analogous to a record in nonrelational databases.
		Tuple is used in abstract mathematics to denote a multidimensional coordinate system.
	whatis.techtarget.com /definition/0,,sid9_gci213231,00.html (233 words)

	JAS Tuple Explorer
		The JAS Tuple explorer is based on the FreeHEP application framework, and uses many components from the Java Analysis Studio application.
		The JAS Tuple Explorer will eventually be available as both a standalone program and as a plugin for JAS 3.0.
		The JAS Tuple explorer will be an AIDA compliant application able to exchange data and plots with other AIDA applications.
	jas.freehep.org /documentation/tupleexplorer (1255 words)

	The Blogosphere as a Tuple Space » Archive » Blog » 0xDECAFBAD (Site not responding. Last check: 2007-11-07)
		Or rather, each person’s light cone in the blogosphere, made up of the feeds and blogs you track and what you publish, is a Tuple Space–and the blogosphere itself is the union of every personal Tuple Space in existence.
		Where the data items within tuples pick up meaning is through agreement amongst users of the tuple space.
		Tuple spaces get really interesting, though, because different collectives of users of the tuple space can each agree upon different sets of meanings for tuples–and the agreements exist outside of tuple space, so the space doesn’t need reconfiguration for any particular new use.
	www.decafbad.com /blog/2005/01/12/the_blogosphere_as_a_tuple_space (1304 words)

	Tuple-versioning: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-11-07)
		These two values indicate the validity of the rest of the values in the tuple.
		In general, a query is a form of questioning, in a line of inquiry....
		The end time for the Engineer tuple would be equal to the start time for the Manager tuple.
	www.absoluteastronomy.com /encyclopedia/t/tu/tuple-versioning.htm (341 words)

	Topic Maps Query Language
		All tuples of the incoming tuple sequence are compared according to the equality rules in section Clause 5.
		When operating on tuple sequences, it may sometimes be necessary to select particular columns out of the tuples in the incoming tuple sequence and to form with these new tuples for an outgoing tuple sequence.
		Each tuple represents a set of values for the variables in which the statement represented by the query is true, according to the topic map(s) being queried.
	www.isotopicmaps.org /tmql/spec.html (6306 words)

	A Global Passive Tuple Space as a Data Storage and Communications Substrate for Ubiquitous Computing
		However, our current interest is in Passive Tuples for embedded applications and our focus is where a large amount of loosely-coupled data sharing is required and the applications are relatively simple and dynamic.
		Tuples may contain other tuples, and hence a tree structure arises that has features like in common with XML.
		However, every Tuple resides somewhere in a global address space and fields of tuples can change at any time owing to the action of various atomic and non-atomic updates.
	www.cl.cam.ac.uk /users/djg/ao/pushtup.html (892 words)

	The Boost Tuple Library (Site not responding. Last check: 2007-11-07)
		A tuple can be copy constructed from another tuple, provided that the element types are element-wise copy constructible.
		A tuple unpacking operation like this is found for example in ML and Python.
		The default delimiter between the elements is space, and the tuple is enclosed in parenthesis.
	www.boost.org /libs/tuple/doc/tuple_users_guide.html (1862 words)

	Tuple Data Model Faces Real World
		Defined with misleading simplicity as "a series of typed values," the tuple can be to distributed computing what a base pair is to a molecule of DNA: Tuples carry information and provide their own form of organization—in a manner that may seem inefficient—but they enable adaptation to situations not foreseeable when a system was conceived.
		Tuple spaces (network-addressable repositories of tuples, shared by cooperating processes) thus provide a framework for distributed computing in environments, such as mobile and wireless networks, that don't fit the crucial assumptions (such as fast, persistent, synchronous links) that are integral to traditional IT models.
		However, a tuple space, although likewise based on object-oriented matching of data types and encapsulation of behaviors as well as data, will not typically be designed for such complex relationships and will not replace an object database as a transparent, persistent extension of an application's transient object pool.
	www.eweek.com /article2/0,1759,35424,00.asp (1311 words)

	PyLinda: PyLinda - Distributed Computing Made Easy
		Linda is an widely studied distributed computing environment, centered around the notion of a tuple space.
		A tuple space is a bag (also called a multi-set) of tuples.
		Tuple spaces exist independently of processes in the system, and the data placed into a tuple space also exist independently.
	www-users.cs.york.ac.uk /~aw/pylinda (734 words)

	7.3.4 Tuple Objects
		is a tuple object or an instance of a subtype of the tuple type.
		Because tuples are supposed to be immutable, this should only be used if there is only one reference to the object.
		Do not use this if the tuple may already be known to some other part of the code.
	www.python.org /doc/2.3.5/api/tupleObjects.html (215 words)

	1.3 What are tuple relations and sets? (Site not responding. Last check: 2007-11-07)
		An integer tuple relation is a mapping from tuples to tuples.
		The tuple that is being mapped from is refered to as the input tuple and the tuple that is being mapped to is refered to as the output tuple.
		The sets and relations that we use may be infinite or may depend on the values of other variables, so it is generally not possible to describe them simply by enumerating their tuples or pairs of tuples.
	www.cs.umd.edu /projects/omega/interface_doc/node5.html (343 words)

	SQL - Wikipedia, the free encyclopedia
		DML is the subset of the language used to add, update and delete data.
		is used to add zero or more rows (formally tuples) to an existing table.
		Theorists and some practitioners note that many of the original SQL features were inspired by, but in violation of, the relational model for database management and its tuple calculus realisation.
	en.wikipedia.org /wiki/SQL (2291 words)

	Tuplespace (Site not responding. Last check: 2007-11-07)
		The tuples would continue to exist in the metakit db, but didn't waste precious memory if they weren't being actively accessed.
		Tpat is a tuple specification that may have a # "don't care" placeholder (?) in place of any tuple field.
		A set of tuples is the mathematical definition of a relation (strictly, a graph which, together with some domain sets, forms a relation), although relations are usually "typed" in some way (hence the domain sets), which doesn't seem to be the case here.
	wiki.tcl.tk /3947 (2503 words)

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