Incomplete Oracle ASM file names with templates are used only for file creation operations and are used for both single and multiple file creation. They consist of the disk group name followed by the template name in parentheses. When you explicitly specify a template in a file name, Oracle ASM uses the specified template instead of the default template for that file type to determine attributes for the file.
An example of using an incomplete Oracle ASM file name with template is setting the DB_CREATE_FILE_DEST initialization parameter to:
+data(mytemplate)