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Webtags/Parameters: Difference between revisions
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# Some tag names always need an output format specifier
# The majority of tag names have a default output if there is no output format modifier, but accept either one or two output format parameters, allowing you to change what they output.
=== Null values ===
From version 4.3. onwards CMX uses null values in its database and system. For webtags that may have consequences in the value returned. As originally webtags returned string values and cosnequently the default vaalue for ''null'' is a dash ("-"). However when using a webtag in a calculation, webquery, value in a customlog or as a javascript value it may be not so useful to have a dash. For this CMX offers a ''null value conversion method'': if the value is null and the user can't have a dash CMX offers the output modifier ''nv=xxx'' to replace the default dash.
The value of xxx can be:
#null => the output produces the string null (e.g. nv=null)
#number => the output produces the number (e.g. nv=0)
=== Numbers ===
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