Specifying string values - References - SIMATIC AX - AX Hardware Engineering documentation - Hardware Engineering,

In the SIMATIC AX Hardware Declaration Language, the backtick (`) and $ characters have special meaning in string values:

• $ starts a placeholder expression, for details see Templates
• ` is used as escape character

To include these characters in a string, they need to be escaped using a single backtick. Thus, to include a single backtick in a string use ``, to include a $, use `$.

The following examples show the usage of these characters in an hardware declaration file:

{
  "Property1": "${Example}",
  "Property2": "`${Example}",
  "Property3": "Example$Value",
  "Property4": "Example`$Value",
  "Property5": "Example`Value",
  "Property1": "Example``Value"
}

• The value of Property1 is interpreted as placeholder expression and only valid inside of a template
• The value of Property2 uses a backtick to indicate the value `${Example} should not be treated as placeholder expression
• The value of Property2 is invalid, since the $ character is reserved. To express a string value that contains the $ character, use `$ as shown in the value for Property4
• Similarly, the value of Property5 is invalid, since the ` character is used as escape character. To express a string value that contains a backtick character, use `` as shown in the value for Property6