The Expression Editor
The expression editor is available in many different contexts. Often, when specifying parameter values such as connection parameters, link criteria and so forth we can use the expression editor instead of typing a simple value for the parameter.
Use Property
This option lets you choose an existing property from your property stores or create a new property/value pairExpression Editor: simple property
When you select a property, the Name text field below the tree is updated with the expression for that property. By default, the expression includes the store name ("Example" in this case) followed by a colon and the property name ("Username" in this case). When you click OK, the expression in the text field is used for the parameter. This also means that you can type the expression directly in this field without going through the tree of properties. If you for example know that there is a property called "FilePath" on the server this solution will run on, we can remove the store name if you don't know that (that is, type "FilePath" without the "store:" prefix).
Advanced (JavaScript)
With this option the value is computed as the result of JavaScript code you enter in the editorExpression Editor: Advanced (JavaScript)
Text with substitution
This is the " Security Directory Integrator Expression" from version 6.x. From version 7 onwards, it is recommended to use JavaScript for complex evaluation of variables and properties. This option however is very useful when you want to enter large amounts of text. The substitution options are compatible with version 6 expressionsExpression Editor: text with v.6-style substitution
