# vs $ in the computed expressions in the xpages

In the xml code of the xpages the computed expressions begin with the character “#” or with the character “$”, ie they are one of the following types:

  • value=”#{[language]:[expression]}”
  • value=”${[language]:[expression]}”

where [language] is the name of the language, for example javascript and [expression] is the expression to compute.

The question is “what is the difference between the two cases?”.