What does rdrefg mean, what does rdg mean rdg

This pro is the English you typed blindly =. =|、

1. RDG: The abbreviation of reading is the meaning of reading, that is, reading. Type sleepy hand dgt:

Abbreviation for digit, the minimum runout value of the numeric table, that is, the minimum ruler to display the resolution, or the minimum resolution. The number of digits displayed by the instrument is 3 and a half, 4 and a half, 5 and a half digits, and so on.

2. RDG should be understood separately:

r refers to the standard signal used for measurement.

dg stands for differential divination gain. r--dg should be expressed like this.

To put it simply, it means accuracy and resolution!

Two meanings: RDF (Resource Description Framework), a markup language used to describe web resources. resource:

Everything that is named on the web and has a URI (Unified Resource Identifier). Such as web pages, XML documents.

elements, etc.; Decription: A statement about a property.

RDF is used for information needs to be applied.

Deal with the occasion and not just show it to people. RDF provides a common framework for expressing this information and making it possible to exchange it between applications without losing semantics. Since it is a generic framework, application designers can take advantage of an off-the-shelf generic RDF parser.

Resource Description Framework (RDF) is a markup language used to describe web resources. Resource: Everything that is named on the web and has a Unified Resource Identifier (URI).

e.g. elements in web pages, XML documents, etc.; Decription: A statement of a property, indicating the properties of a resource or the relationship between resources; Frameword: A generic model that is not tied to the resource being described, to accommodate and manage the diversity, inconsistencies, and repetition of resources.

Taken together, RDF defines a general framework, that is, a triplet of resources, attributes, and values, which is constant and changeable, to describe various resources on the web. A simple RDF example (indicating the URI of the described resource) Tim Bray (the described resource has a property called author, whose value is "home-page" (the value of which points to another resource) (end flag) 2Two key technologies RDF has two key technologies – URI and XML.

A URI is a unique identifier for a web resource, and it is a superset of the more commonly used Uniform Resource Locator URLs, which can identify elements on a page, books, TVs, and even a person. In RDF, resources are ubiquitous, properties of resources are resources, the value of properties can be resources, and even a statement can be resources, that is, all of these can be identified by URIs, which can then be described by RDF. So how does RDF put it on the Internet for people to use?

XML takes on this responsibility as a general-purpose file format, which defines the RDF representation syntax, so that XML can be easily exchanged for RDF data.

The RDF data model is a syntax neutral representation. If two RDF syntax correspond to the same data model, it means that the two RDF syntax have the same meaning, and conversely, if two RDF syntax have the same meaning, their data model should be the same. RDF's basic data model consists of three object types:

Resource: Everything described in RDF notation is called a resource, it may be a **, it may be a web page, it may just be a part of the web page, or even something that does not exist in the network, such as paper documents, artifacts, people, etc. In RDF, resources are named with uniform resource indentifiers (URIs), and uniform resource locators (URLs) and uniform resource names (URNs) are subsets of URIs.

Properties: Attributes are used to describe specific characteristics or relationships of resources, each property has a specific meaning, and is used to define its property value (value) and the form of the resource it describes, as well as the relationship with other properties. RDF's (property, property value) is conceptually the same as the traditional (attribute, attribute value).

Statements: A specific resource is described by a named attribute and the corresponding attribute value, called an RDF statement, where the resource is the subject, the attribute is the predicate, and the attribute value is the object, and the subject of the statement may be a string, or it may be other data forms or a resource.