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--- visual3d:documentation:pipeline:expressions:reserved_characters [2024/06/19 13:36] – removed sgranger
+++ visual3d:documentation:pipeline:expressions:reserved_characters [2024/07/17 15:45] (current) – created sgranger
@@ Line 1: / Line 1: @@
+====== Reserved Characters ======
+Reserved Characters in Expressions
+==== Contents ====
+  * [[#AMP|1 AMP]]
+  * [[#COLON|2 COLON]]
+  * [[#SEMICOLON|3 SEMICOLON]]
+  * [[#PLUS|4 PLUS]]
+  * [[#FSLASH|5 FSLASH]]
+  * [[#SPACE|6 SPACE]]
+==== AMP ====
+AMP = &
+For example, if the desired pipeline command were as follows:
+**Select_Active_File**
+/FILE_NAME=ALL_FILES
+/QUERY= TAG1 & TAG2
+**;**
+If the tags TAG1 and TAG2 exist then all files that have been assigned both tags will be active.
+If, however, we want to use pipeline parameters in place of the text TAG1 and TAG2, we have a problem because there is no way to stop Visual3D from using the & character to concatenate the text. The solution was to introduce a reserved parameter ::AMP.
+The following pipeline would result
+Set_Pipeline_Parameter
+**Set_Pipeline_Parameter**
+/PARAMETER_NAME=A
+/PARAMETER_VALUE=TAG1
+**;**
+**Set_Pipeline_Parameter**
+/PARAMETER_NAME=B
+/PARAMETER_VALUE=TAG2
+**;**
+**Select_Active_File**
+**/FILE_NAME=ALL_FILES**
+**/QUERY= ::A&::AMP&::B**
+**;**
+This would result in Visual3D interpreting the query
+/QUERY=TAG1 & TAG2
+For more: [[https://www.c-motion.com/v3dwiki/index.php?title=Expressions:_Examples_of_Using_the_AMP_Operator|Examples of Using the AMP Operator]]
+==== COLON ====
+COLON = :
+==== SEMICOLON ====
+SEMICOLON = ;
+==== PLUS ====
+PLUS = +
+==== FSLASH ====
+FSLASH = /
+==== SPACE ====
+SPACE=" "