Catalogue is a tool to describe and report literature information in a certain order by complete publishing units (such as books or periodicals), also known as bibliography. The description of documents in the catalogue is relatively simple, and the fields of each record mainly include: document title, person in charge, publishing project, classification number, subject words and so on. A publication is described in this way, forming a record, and all the records are organized to form a directory.
What is a metabase?
What is metadata?
Metadata, data about data, or data to describe data, or information called information.
These definitions are very abstract, and we can simply understand metadata as the smallest unit of data. Metadata can explain elements or attributes (name, size, data type, etc. ), or its structure (length, field, data column), or its related data (location, contact, owner).
Give a few simple examples:
Students who have used digital cameras should know that every digital photo will have an EXIF message. It is a kind of metadata used to describe digital pictures. According to EXIF standard, these metadata include: Image Description (source). Refers to tools for generating images), artists (authors), producers (producers), models (models), ..., and so on.
The personal information registration form we fill in in our life, including name, gender, nationality, political outlook, one-inch photo, education background, professional title, etc., is the metadata that locks kent.zhu.
Generally speaking, metadata can be divided into the following three categories: permanent metadata, management metadata and descriptive metadata.
Inherent metadata; Metadata related to the composition of things.
Administrative metadata; Metadata related to the way things are handled.
Descriptive metadata; Metadata related to the essence of things.
Of course, it does not mean that data can always be clearly divided into the above three categories. For example, kent took a photo of a Christmas card with a puppy in JPG format with a size of 20 K.
Its entity metadata includes: 20K, JPG；; ; Management metadata: Kent shooting, Christmas cards; Descriptive metadata: dogs, puppies, Christmas, photos, Christmas, …
However, Christmas cards can be placed in any of the above categories. It is related to the composition of things (explain what this thing is), the way things are handled (explain what this thing is for), and the essence of things (can be directly used to describe this thing).
The Significance of Metadata to Information Construction
Metadata is an effective way to ensure that all forms of content on the website can be found. For example, we often worry about searching for a beautiful picture we saw a long time ago, and if the information structure of a photo website is good enough, we can rely on the metadata we recall (about Wu Tenglan? Taken in 2000? ) find out.
Metadata to information architecture is like a brick of a house, which can be put into different information retrieval systems as needed. Metadata is the foundation of all organizational systems, and the navigation system on e-commerce websites strongly relies on metadata.
As mentioned earlier, metadata actually serves the searchability of products. Users don't look for information according to machine thinking (they don't enter the ID of the photo), but directly enter descriptive information about the information, such as "puppy Christmas card". This means that when creating descriptive metadata, try to extract the stories about this object told by officials, which are the details that people can remember and are used to searching.
We will find that the metadata generated by machinery is often unreliable, such as some metadata automatically generated by mechanical analysis according to the title when publishing logs under the uch system.
Making full use of manual metadata is a good way to improve the searchability. The most common example is the label we see. A tag is a kind of user ... >>
Question 2: How much bibliographic data does the central bibliographic database contain? Bibliographic database [1] is a kind of database that stores secondary literature in a certain field (such as bibliographic data such as catalogues, bibliographies and abstracts). ), sometimes called secondary literature database, or literature database for short. It mainly provides basic bibliographic information such as the title, author and source of the literature, and some provide the literature. Common bibliographic databases include biological abstracts, national newspaper indexes, abstracts of China academic journals and scientific abstracts.
Question 3: What's the difference between a bibliographic retrieval system and an e-book database? You can retrieve books outside the library at most. E-books need to be downloaded in the library or campus. E-book booksellers have made ip restrictions, and only campus ip can download or read e-books.
Question 4: What is the function of collection catalogue in bibliographic database? Library catalogue is a tool to prompt and retrieve the collected documents. Prompt documents include record documents and report documents. Document description is to accurately describe the content and formal characteristics of documents through various items, provide readers with bibliographic knowledge about various documents and help them understand the contents of collected documents; Reporting documents refers to publicizing and reporting related documents to readers according to a certain problem and a certain compiling purpose. Readers can retrieve the collected documents through the library catalogue. The first is the identification of documents, that is, through the contents and structural forms of various items, readers can identify and confirm the documents. Then literature retrieval, that is, through the concentration and combination of items, provides readers with ways to choose and obtain literature from the aspects of subject owner, theme and classification.
The basic feature of library catalogue is to reflect the collected documents. It reflects the scope of literature collection and has two meanings: in a narrow sense, it refers to the literature collection of the library; In a broad sense, it refers to the literature collection of a library and the literature collection of libraries in a region (or country) or even several regions (or countries). From the development trend, due to the emergence of electronic computers, machine-readable catalogs have emerged. Through online retrieval, documents of various countries can exchange needed goods, establish lending relationship and realize resource sharing. Therefore, this collection catalogue is far from a museum or several museums, but a "collection" of different places and regions. It is impossible for any library to collect all the documents, ancient and modern, Chinese and foreign. In order to solve the contradiction between the limitation of literature collection and the extensiveness of readers' needs to the greatest extent, we should further reflect the literature collected by other libraries through various collection catalogues as far as possible on the basis of correctly reflecting the literature of our library. This can not only answer whether a certain document is collected by our library, but also further answer whether other libraries collect it.
Question 5: Bibliographic database mainly provides the number of documents for the second time.
Question: What are the references in the gas-liquid equilibrium data of Detherm database? Hello, I'm glad to answer your question.
See VLE-3597d. 1983.
Data segment DDB
They are: VLE stands for gas-liquid equilibrium data, and the literature is published in 1983, from DDB database (Dortmund database, a famous German thermodynamic database).
As for 3567d, it may be the page number of the database or the table number in the database.
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Question 7: How many books are there in Amazon's bibliographic database? Amazon, an American e-commerce giant that started with online book sales, opened its first physical bookstore in Seattle last fall, and the second one is expected to settle in San Diego this summer. There may be more in America in the future.
Going from online to offline reflects Amazon's unique book marketing method, and its innovative actions may have a long-term impact on the book industry.
Question 8: How many times do we often use various bibliographies, bibliographies and abstract databases? I'll go. . This radish and cabbage have their own tastes!