# G.3 Depend The `<depend>` tag selects files whose last modified date is later than another, equivalent file in another location. The `<depend>` tag supports the use of a contained [Appendix聽F](apf.html "Appendix F. Core mappers") element to define the location of the file to be compared against. If no `mapper` element is specified, the identity type mapper is used. The `<depend>` tag is case-sensitive. ``` <fileset dir="phing-2.4.5/classes" includes="**/*.php"> <depend targetdir="phing-2.4.6/classes"/> </fileset> ``` Table G.3:聽 Attributes for the `<depend>` selector NameDescriptionDefaultRequired`targetdir`The base directory to look for the files to compare against. The precise location depends on a combination of this attribute and the `mapper` element, if any.n/aYes`granularity`The number of milliseconds leeway to give before deciding a file is out of date. This is needed because not every file system supports tracking the last modified time to the millisecond level.0No