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A robots.txt file contains instructions for bots indicating which web pages they can and cannot access. Robots.txt files are particularly important for web crawlers from search engines such as Google. A robots.txt file on a website will function as a request that specified robots ignore specified files or directories when crawling a site.
Macro languages transform one source code file into another. A "macro" is essentially a short piece of text that expands into a longer one (not to be confused with hygienic macros), possibly with parameter substitution. They are often used to preprocess source code. Preprocessors can also supply facilities like file inclusion.
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.
URDF, Unified Robot Description Format is an XML format for representing a robot model. [1] URDF is commonly used in Robot Operating System (ROS) tools such as rviz (Ros Visualization tool) and Gazebo simulator. [2] The model consists of links and joints motion.
Software for industrial robots consists of data objects and lists of instructions, known as program flow (list of instructions). For example, Go to Jig1 It is an instruction to the robot to go to positional data named Jig1. Of course, programs can also contain implicit data for example Tell axis 1 move 30 degrees.
The empty list () is also represented as the special atom nil. This is the only entity in Lisp which is both an atom and a list. Expressions are written as lists, using prefix notation. The first element in the list is the name of a function, the name of a macro, a lambda expression or the name of a "special operator" (see below).
This is a list of the instructions that make up the Java bytecode, an abstract machine language that is ultimately executed by the Java virtual machine. [1] The Java bytecode is generated from languages running on the Java Platform, most notably the Java programming language.
The following is a list of three elements. The first two elements are themselves lists of two elements: ((A B) (HELLO WORLD) 94) Lisp has functions to extract and reconstruct elements. [81] The function head() returns a list containing the first element in the list.