====== Workspace Functions ======

Most Visual3D commands act on the active files and active subjects.This page contains a list of all functions that can be applied to the active workspace.

==== File Tag Exists ====

**File_Tag_Exists(a)** - Tests the existence of a file tag "a" within the workspace's active files, where "a" must be specified within [[visual3d:documentation:pipeline:expressions:expression_syntax#tag_syntax|the TAG:: namespace]]. Returns 1 if the file tag exists and 0 otherwise. This behaviour is similar to the expression [[visual3d:documentation:pipeline:expressions:signal_functions#data_exists|Data Exists]].

Example, compute “something” only if the file tag SPECIAL exists.

<code>
Conditional_Statement
/ITERATION_PARAMETER_NAME=TEST_SPECIAL
/EXPRESSION=File_Tag_Exists(TAG::SPECIAL)
! /AS_INTEGER=TRUE
;

! ...commands to execute

Conditional_Statement_End
/ITERATION_PARAMETER_NAME=TEST_SPECIAL
;
</code>