MarkLogic 10 Product Documentation
Text.substring

Text.substring(
   offset as Number,
   count as Number
) as Number

This is inherited from the CharacterData object.

A substring of the character data, starting at a given offset and continuing for a given length.

Parameters
offset	The starting position.
count	The length of the substring to return.

The offset and count should be non-negative integers. An error will be raised if they are not.

It is an error for the offset plus the count is more than the size of the data.

cts.doc("example.xml").root.firstChild.substring(2,5)

MarkLogic 10 Product DocumentationText.substring