The dtml-var Tag in zope

The dtml- var tag is used to perform simple variable substitutions. A number of attributes are provided to control how text is to be inserted and formatted. The attributes are summarized in table 15.

dtml-var tag attributes

Attribute name	Needs an argument?	Description
name	yes	Insert the name of the variable.
expr	yes	Insert an expression that evaluates a value.
fmt	yes	Specify a data format, which may be a special, custom, or C-style format.
null	yes	Specify a string to be substituted for null values.
lower	no	Convert all upper-case letters to lower case
upper	no	Convert all lower-case letters to upper case.
capitalize	no	Convert the first character of the inserted to upper case.
spacify	no	Convert underscores in the inserted value to spaces.
thousands_commas	no	In a value containing all numbers, insert commas every three digits to the left of a decimal point. For example, "12000 widgets" becomes "12,000 widgets".
html_quote	no	Convert characters that have special meaning in HTML to HTML character entities.
url_quote	no	Convert characters that have special meaning in URLs to HTML character entities using decimal values.
url_quote_plus	no	Converts a single space character in URLs to the plus sign "+".
sql_quote	no	Convert single quotation mark to a pair of single quotation marks. This is needed to safely include values in Standard Query Language (SQL) strings.
newline_to_br	no	Convert new-line characters, carriage-return characters, and new-line-carriage-return character combinations to new-line characters followed by HTML break tags.
size	yes	Truncate the value to the given size.
etc	yes	Provide a string to be added to truncated text to indicate that truncation has occurred. The default value is "...".
missing	no	Provide a value to be used if the variable is missing, rather than raising an KeyError. Used without an argument, it will provide an empty string.