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#!N
#!CDarkGreen #!N #!Rmbmdf (2) Create a module description file #!N
#!EC #!N #!N Data Explorer's graphical user interface and executive access
the module description file to determine the names of the modules
and their inputs and outputs. #!N Note: This type of file
is commonly referred to as an "mdf" file (because of its
file extension) and is created automatically from user input to the
Module Builder, as described in #!Lmblder,dxall1003 h Module Builder #!EL . However, for very simple
modules like the one in this example, it is usually easier
and quicker to create the file with a text editor. #!N
#!N #!N Parameter names are a part of the module interface
that can be seen by the user. In the graphical user
interface, parameter names appear in the configuration dialog box and also
serve as default names for interactors. In the scripting language, module
parameters can be specified by name. #!N #!N A new module
cannot have the name of an existing Data Explorer module (see
IBM Visualization Data Explorer User's Reference for a complete list). You
should also be aware of the following requirements: #!N #!I0 #!N
#!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N o A Data Explorer module name
must be a single alphanumeric string and its first character must
be a letter. (Standard Data Explorer module names capitalize the first
character of each "word" in a name, as in Attribute and
AutoAxes. You may observe this convention or not, as you wish,
for the modules you create.) #!N #!I30 #!N o The module
must be assigned to a tool category--in a #!F-adobe-times-bold-r-normal--18* CATEGORY #!EF
statement in the module description file. The category can be any
of those listed in the Category palette of the VPE window
or a new one that you create by naming it in
the statement. #!N #!I0 #!N #!EF #!N #!N #!N In the
following example, the mdf file consists of five statements: #!CForestGreen #!N
#!N #!F-adobe-courier-bold-r-normal--18* #!N #!N MODULE Hello #!N CATEGORY Greetings #!N DESCRIPTION
Prefixes "hello" to the input string #!N INPUT value; string; "world";
input string #!N OUTPUT greeting; string; prefixed string #!N #!EF #!N
#!N #!EC #!N #!I0 #!N #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* MODULE
#!EF #!EF #!I50 #!N Specifies the module name as Hello. #!N
#!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* CATEGORY #!EF #!EF #!I50 #!N Assigns the
module to a new, user-specified category (Greetings). #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18*
#!F-adobe-times-bold-r-normal--18* DESCRIPTION #!EF #!EF #!I50 #!N Describes Hello's purpose: to affix
"hello" to the input string. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* INPUT
#!EF #!EF #!I50 #!N Assigns the name #!F-adobe-times-bold-r-normal--18* value #!EF to
the input parameter; specifies its parameter type as #!F-adobe-times-bold-r-normal--18* string #!EF
; specifies its default value as "world"; and describes it as
an input string. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* #!F-adobe-times-bold-r-normal--18* OUTPUT #!EF #!EF
#!I50 #!N Assigns the name #!F-adobe-times-bold-r-normal--18* greeting #!EF to the output
parameter; specifies its parameter type as #!F-adobe-times-bold-r-normal--18* string #!EF ; and
describes it as a prefixed string. #!I0 #!N #!N #!N #!N
For details, see #!Lmdfsec,dxall1046 h Module Description Files #!EL . #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic
#!EF #!N #!N #!Lall993,dxall994 h (3) Write the module #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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