Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "Our crime_type parameter has been recognized and added to the table."

A block of code is set as follows:

SELECT 
    ID, 
    REPORTED_BY, 
    CRIME_TYPE, 
    LAST_OUTCOME_CATEGORY, 
    GEOM 
FROM 
    STREET_LEVEL_CRIME 
WHERE 
    CRIME_TYPE = '%crime_type%' 
    AND 
    LAST_OUTCOME_CATEGORY = 'Under investigation'

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

- !columns
    widths: [709, 113]
    width: 822
    absoluteX: 10
    absoluteY: 585
    items:
      - !text
        text: '${mapTitle}'
        font: Arial Bold
        fontSize: 28
        vertAlign: middle
      - !image

Any command-line input or output is written as follows:

$ sudo service tomcat-1 restart
$ sudo service tomcat-2 restart

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "To the right of the map, there is a Print Settings box that contains controls that can be used to set the content for print."