Enter the start separator. A control is performed between the start and end tags to make sure that the tags are consistent with each other.
You can add an attribute in the XML tag:
For example:
If the start separator contains the code $1$, the first occurrence of $1$ is replaced by the result of the evaluated formula. The other occurrences of $1$ are not modified.
If the start separator does not contain that $1$ code, the result of the formula is displayed in the XML file after the tag.