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  2. Query string - Wikipedia

    en.wikipedia.org/wiki/Query_string

    A query string is a part of a uniform resource locator that assigns values to specified parameters.A query string commonly includes fields added to a base URL by a Web browser or other client application, for example as part of an HTML document, choosing the appearance of a page, or jumping to positions in multimedia content.

  3. List of DOS commands - Wikipedia

    en.wikipedia.org/wiki/List_of_DOS_commands

    For example, in DOS 5, if the current directory is C:\TEMP, then TRUENAME command.com will display C:\TEMP\COMMAND.COM (which does not exist), not C:\DOS\COMMAND.COM (which does and is in the PATH). This command displays the UNC pathnames of mapped network or local CD drives. This command is an undocumented DOS command.

  4. Comma-separated values - Wikipedia

    en.wikipedia.org/wiki/Comma-separated_values

    Comma-separated values (CSV) is a text file format that uses commas to separate values, and newlines to separate records. A CSV file stores tabular data (numbers and text) in plain text , where each line of the file typically represents one data record .

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  6. Hard coding - Wikipedia

    en.wikipedia.org/wiki/Hard_coding

    A similar problem may occur if the same hard-coded value is used for more than one parameter value, e.g. an array of 6 elements and a minimum input string length of 6. A programmer may mistakenly change all instances of the value (often using an editor's search-and-replace facility) without checking the code to see how each instance is used.

  7. Context-free grammar - Wikipedia

    en.wikipedia.org/wiki/Context-free_grammar

    is context-free. It is not proper since it includes an ε-production. A typical derivation in this grammar is S → aSa → aaSaa → aabSbaa → aabbaa. This makes it clear that = {: {,}}. The language is context-free; however, it can be proved that it is not regular. If the productions S → a,

  8. Empty set - Wikipedia

    en.wikipedia.org/wiki/Empty_set

    As a result, the empty set is the unique initial object of the category of sets and functions. The empty set can be turned into a topological space, called the empty space, in just one way: by defining the empty set to be open. This empty topological space is the unique initial object in the category of topological spaces with continuous maps.

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