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Topic: Datatype


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In the News (Mon 28 Dec 09)

  
  DataType
It is sometimes useful to discover if a DataType represents a real numeric value (i.e., can it be cast to a Double?) This returns True for both real scalar and array type.
It is occasionally useful to discover whether or not a DataType represents an array or scalar value.
These (overloaded) functions return DataType that corresponds to to the type that is being pointed at.
www.aoc.nrao.edu /~ddebonis/doxygen/prototype/group__DataType.html   (437 words)

  
  Datatype - Wikipedia, the free encyclopedia
In computer science, a datatype or data type (often simply a type) is a name or label for a set of values and some operations which one can perform on that set of values.
Programming languages implicitly or explicitly support one or more datatypes; these types may act as a statically or dynamically checked constraint, ensuring valid programs for a given language.
Assigning datatypes ("typing") has the basic purpose of giving some semantic meaning to otherwise meaningless collections of bits.
en.wikipedia.org /wiki/Datatype   (2607 words)

  
 Datatype Interface (H5T)
The datatype interface provides a mechanism to describe the storage format of individual data points of a data set and is hopefully designed in such a way as to allow new features to be easily added without disrupting applications that use the datatype interface.
A datatype is a collection of datatype properties, all of which can be stored on disk, and which when taken as a whole, provide complete information for data conversion to or from that datatype.
An HDF enumeration datatype is a 1:1 mapping between a set of symbols and a set of integer values, and an order is imposed on the symbols by their integer values.
hdf.ncsa.uiuc.edu /HDF5/doc/Datatypes.html   (10199 words)

  
 simple RDF datatype
A datatype is defined abstractly by two domains, one of lexical forms and one of values, and a mapping from lexical forms to values.
A datatype triple says that the literal is a legal way to express the value according to the particular rules associated with that datatype's lexical-to-value mapping.
The datatype triple is the most 'local' style of literal datatyping in RDF.The interpretation imposed on the literal by the datatype is local to this triple.
www.ihmc.us /users/phayes/simpledatatype2.html   (1950 words)

  
 XML Schema Part 2: Datatypes: Datatype dichotomies
Union datatypes are those whose value spaces and lexical spaces are the union of the value spaces and lexical spaces of one or more other datatypes.
The datatypes that participate in the definition of a union datatype are known as the memberTypes of that union datatype.
A datatype is said to be derived by restriction from another datatype when values for zero or more constraining facets are specified that serve to constrain its value space and/or its lexical space to a subset of those of its base type.
www.stylusstudio.com /w3c/schema2/datatype-dichotomies.htm   (1327 words)

  
 Resource Description Framework (RDF): Concepts and Abstract Syntax   (Site not responding. Last check: 2007-10-19)
Datatypes are used by RDF in the representation of values such as integers, floating point numbers and dates.
The datatype abstraction used in RDF is compatible with the abstraction used in XML Schema Part 2: Datatypes [XML-SCHEMA2].
For example, the QName datatype requires a namespace declaration to be in scope during the mapping, and is not recommended for use in RDF.
www.w3.org /TR/2004/REC-rdf-concepts-20040210   (4679 words)

  
 Datatype Library Language (DTLL)   (Site not responding. Last check: 2007-10-19)
So the primary motivation for putting together a language for datatype libraries is to enable RELAX NG users to construct their own datatypes without having to resort to a procedural programming language or having to learn how to use XML Schema, which might not be suited for their needs.
If a DTLL version 0.4 processor encounters a datatype library with a version higher than 0.4, it must treat any attributes or elements that it doesn't understand (that are not part of DTLL 0.4) in the same way as it would treat extension attributes or elements found in the same location.
Anonymous datatypes are used to provide the datatype for a property or variable if that property or variable's type can't be referred to by name.
www.jenitennison.com /datatypes/DTLL.html   (4615 words)

  
 Decoding a Datatype
datatype must be a predefined unnamed or a derived datatype; the call is erroneous if datatype is a predefined named datatype.
The datatypes returned in array_of_datatypes are handles to datatype objects that are equivalent to the datatypes used in the original construction call.
The datatypes returned in array_of_datatypes must appear to the user as if each is an equivalent copy of the datatype used in the type constructor call.
www-unix.mcs.anl.gov /mpi/mpi-standard/mpi-report-2.0/node161.htm   (1648 words)

  
 XML Schema Part 2: Datatypes
The datatype language, which is itself represented in XML 1.0, provides a superset of the capabilities found in XML 1.0 document type definitions (DTDs) for specifying datatypes on elements and attributes.
The ·lexical space· of a ·list· datatype is a set of literals whose internal structure is a white space separated sequence of literals of the ·atomic· datatype of the items in the ·list· (where whitespace ·match·es S in [XML 1.0 (Second Edition)]).
For example, a datatype could be defined to correspond to the [SQL] datatype Year-Month interval that required a four digit year field and a two digit month field but required all other fields to be unspecified.
www.w3.org /TR/2001/REC-xmlschema-2-20010502   (8534 words)

  
 argouml: 15.3. Datatype
button on the property tabs of the model and packages (in which case the new datatype is restricted in scope to the package), as well as the properties tab for datatype.
Since user defined datatypes are enumerations, they have no state to preserve, and the value of this tagged value is irrelevant.
While it can make sense to create datatypes this way, it can be clearer to create them within the package or model where you want them.
argouml.tigris.org /documentation/defaulthtml/manual/ch15s03.html   (855 words)

  
 Oracle Data Types
Datatype summary for Oracle 7, 8 and 9
Binary format of an operating system label.This datatype is used with Trusted Oracle7.
Confusingly the Units of measure for PRECISION vary according to the datatype.
www.ss64.com /orasyntax/datatypes.html   (824 words)

  
 [No title]
Constructing derived datatypes is mainly a case of going through each of the arguments to the routine you want to use and putting in the appropriate values.
Any datatypes derived from a freed datatype are unaffected when it is freed, as are any communications that are using the freed datatype at the time of the freeing.
Derived datatypes should provide an efficient method of sending data since the data can be moved from its location in one process's memory to a location in a different process's memory without any intermediate buffering.
www.pdc.kth.se /training/Talks/MPI/Derived/more.html   (2799 words)

  
 Nine by Nine: Using datatype-aware inferences with RDF
The GraphClosure datatype is polymorphic in lb, the type of node that may appear in a graph.
To incorporate datatype reasoning, a number of special variable binding modifiers can be defined, corresponding to different relationships between values of common datatypes.
It was noted above in OWL Datatype Groups that a class restriction is applicable over the class of things defined, without introducing name for such things that must be universally quantified.
www.ninebynine.org /RDFNotes/RDF-Datatype-inference.html   (5331 words)

  
 Datatype   (Site not responding. Last check: 2007-10-19)
representing six different streaming datatypes have announced their support for the...
Programming languages implicitly or explicitly support one or more datatypes; these types may act as a statically or dynamically checked constraint on the programss that can be written in a given language.
The definition is known as the Liskov substitution principle.
www.hallencyclopedia.com /Datatype   (2576 words)

  
 Datatype constructors
The type map of the datatype returned by newtype is { (double, 0), (char, 8), (double, 16), (char, 24), (double, 32), (char, 40) } ; i.e., alternating double and char elements, with displacements 0, 8, 16, 24, 32, 40.
The spacing between blocks is a multiple of the extent of the old datatype.
Indexed The function MPI_TYPE_INDEXED allows replication of an old datatype into a sequence of blocks (each block is a concatenation of the old datatype), where each block can contain a different number of copies and have a different displacement.
www.mcs.anl.gov /mpi/mpi-standard/mpi-report-1.1/node55.htm   (1059 words)

  
 RELAX NG with custom datatype libraries   (Site not responding. Last check: 2007-10-19)
This datatype is the most complicated class you have to write.
Determine whether a given string is a valid instance of the datatype.
James Clark's Jing includes a sample datatype implementation that verifies that the parentheses in a string are balanced.
www-106.ibm.com /developerworks/xml/library/x-custyp   (2221 words)

  
 Selecting a Datatype   (Site not responding. Last check: 2007-10-19)
A datatype associates a fixed set of properties with the values that can be used in a column of a table or in an argument of a procedure or function.
Where applications store date values in CHAR or VARCHAR2 datatypes, and the century information is not maintained, you will need to modify the application to include routines which ensure that such dates are treated appropriately when affected by the change in century.
The ANSI datatype conversions to Oracle datatypes are shown in Table 3-3.
www.usd.edu /oracle/doc/appdev.817/a76939/adg04typ.htm   (5010 words)

  
 Datatype at opensource encyclopedia   (Site not responding. Last check: 2007-10-19)
In computer science, a datatype (often simply called type) is a statically or dynamically assigned constraint on computer programs.
Since the benefits of datatype have proven to be quite important, the majority of programming languages are typed today.
A type system, specified in each programming language, stipulates the ways in which a typed program are allowed to behave, and make behaviors outside rules illegal.
www.wiki.tatet.com /Datatype.html   (1928 words)

  
 Datatype Library Language
These pages describe some experiments that I've been doing with creating a declarative language that can describe datatype libraries for use in RELAX NG and XPath 2.0.
It also might be interesting in terms of Part 5 (Datatypes) of DSDL.
Datatypes in XML presentation - a presentation on DTLL given at XMLOpen 2004; also available as PowerPoint.
www.jenitennison.com /datatypes   (88 words)

  
 HDF5/H5T API Specification
The Datatype interface, H5T, provides a mechanism to describe the storage format of individual data points of a data set and is hopefully designed in such a way as to allow new features to be easily added without disrupting applications that use the data type interface.
It can be used not only to determine the native datatype for atomic datatypes, but also to determine the native datatypes of the individual components of a compound datatype, an enumerated datatype, an array datatype, or a variable-length datatype.
Note: Members of a compound datatype do not have to be atomic datatypes; a compound datatype can have a member which is a compound datatype.
hdf.ncsa.uiuc.edu /HDF5/doc/RM_H5T.html   (4704 words)

  
 Datatype
Construct new datatype representing replication of old datatype into contiguous locations.
Construct new datatype representing replication of old datatype into a sequence of blocks where each block can contain a different number of copies and have a different displacement.
Construct new datatype representing replication of old datatype into locations that consist of equally spaced blocks.
www.cs.bgu.ac.il /~pa051/doc/mpi/Datatype.html   (517 words)

  
 Datatype constructors
The type map of the datatype returned by newtype is { (double, 0), (char, 8), (double, 16), (char, 24), (double, 32), (char, 40) } ; i.e., alternating double and char elements, with displacements 0, 8, 16, 24, 32, 40.
The spacing between blocks is a multiple of the extent of the old datatype.
Indexed The function MPI_TYPE_INDEXED allows replication of an old datatype into a sequence of blocks (each block is a concatenation of the old datatype), where each block can contain a different number of copies and have a different displacement.
www-unix.mcs.anl.gov /mpi/mpi-standard/mpi-report-1.1/node55.htm   (1059 words)

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