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== Syntax ==

{|border="0"
|- style="vertical-align:top"
| style="width:10em" | ''SetStatement''
| style="width:3em" | :=
| style="width:36em" | '''set''' [[OwS Syntax: InternalReference|''InternalReference'']] '''=''' ''SetModeQualifier''* ''AssignedValue''
| style="width:1em" |  
| 
|- style="vertical-align:top"
| ''AssignedValue''
| :=
| [[OwS Syntax: InternalReference|''InternalReference'']]
|
|
|-
|
| style="text-align:right" | |
| [[OwS Syntax: QualifiedConcept|''QualifiedConcept'']]
|
|
|-
|
| style="text-align:right" | |
| '''{''' [[OwS Statement: define|''FullDefinition'']]* '''}'''
|
| can only be used for properties with a custom type. Requires the ''InlineSource'' property of the type to be set to a codesystem object. 
|- style="vertical-align:top"
|
| style="text-align:right" | |
| '''($'''? [[OwS Statement: Base Types|''Text'']]
|
| The prefix "($" advises the OwS interpreter to consider the provided text as a string (which will not be further processed)
|- style="vertical-align:top"
| ''SetModeQualifer''
| :=
|  '''[''' '''Mode''' '''=''' QualiferValueMode ''']'''
|
|controls the overall behavior of the set-statement (see below)
|- style="vertical-align:top"
|
| style="text-align:right" | |
|  '''[''' '''Copy''' '''=''' QualiferValueCopy ''']'''
|
| copy-by-value vs. copy-by-reference
|- style="vertical-align:top"
|
| style="text-align:right" | |
|  '''[''' '''Delimiter''' '''=''' ''Name'' ''']'''
|
| for Mode=concat: insert a demiter between the concatenated strings
|- style="vertical-align:top"
| ''QualifierValueMode''
| :=
|   '''default''' | '''overwrite''' | '''no-overwrite''' | '''concat''' | '''append''' | '''add'''
|
|
|- style="vertical-align:top"
| ''QualifierValueCopy''
| :=
|   '''default''' | '''value''' | '''reference'''
|
|
|}

<hr>

== Semantics of the set modes ==
{|class="wikitable"
! Mode
! Sematics
! a=string b=string
! a=object b=object
! a=empty collection
!style="width:7em" | a=collection b=string
!style="width:7em" | a=collection b=object
|- style="vertical-align:top"
| concat
| If a and b are strings, the result is a concatenation of both string. If a is a collection of strings, b will be appended to each element of the collection. Collection elements may be filtered by qualifiers (e.g. set me.Designation[Language=de] =[Mode=concat] ($ (German) appends the text "(German)" to all German designations in the collection.
| ab
| ''error''
| { b }
| {a1b, .. , anb}
| ''error''
|- style="vertical-align:top"
| add
| a and b must be strings representing a numeric value. The result is a string holding the arithmetic sum of a and b. If a is a collection of numeric strings, b will be added to each number element of the collection.
| a+b
| ''error''
| { b }
| {a1+b, .. , an+b}
| ''error''
|- style="vertical-align:top"
| no-overwrite
| The set operation is only performed if a is empty. If a already carries a value or is a non-empty collection, the value of a will not be altered.
| a
| a
| { b }
| { a }
| { a }
|- style="vertical-align:top"
| overwrite
| The value of a is overwritten by b. In case a is a collection, b will be set as the only element of the collection. Collection elements may be filtered by qualifiers (e.g. set me.Designation[Language=de] =[Mode=overwrite] NULL removes all German language designation from the list).
| b
| b
| { b }
| { b }
| { b }
|- style="vertical-align:top"
| append
| If a is a collection, b will be appended to that collection.
| ''error''
| ''error''
| { b }
| { a1, .., an, b }
| { a1, .., an, b }
|- style="vertical-align:top"
| default
| The default behavior is ''Overwrite'' for single strings/objects and ''Append to List'' for collections
| b
| b
| { b }
| { a1, .., an, b }
| { a1, .., an, b }
|}
If no Mode qualifier is given, the behavior of the set-statement is like [Mode=default].

OwS Statement: set - Versionsgeschichte

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