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+
+
+# TransformXml
+
+## XSLT Transform with Parameters
+
+XSLT parameters are placeholders within an XSLT stylesheet that allow external values
+to be passed into the transformation process at runtime.
+Parameters are accessible within a stylesheet as normal variables, using the ```$name``` syntax,
+provided they are declared using a top-level ```xsl:param``` element.
+If there is no such declaration, the supplied parameter value is silently ignored.
+
+### XSLT with Parameter Defined
+Consider the following XML
+```xml
+
+
+ - Some data
+
+```
+and XSLT stylesheet
+```xml
+
+
+
+
+
+
+ Value Selected:
+
+
+
+
+```
+If the following parameter name ```customParam``` and parameter value ```From NIFI``` pair are added
+as a dynamic property, then the output would be
+```xml
+
+
+
+ Value Selected: From NIFI
+
+```
+Note the value of the ```customParam``` parameter became ```From NIFI``` even though
+the declared ```xsl:param``` element had a default value of ```From XSLT```.
+
+### XSLT without Parameter Defined
+If the XSLT stylesheet does not have a top-level ```xsl:param``` element declared
+```xml
+
+
+
+
+
+ Value Selected:
+
+
+
+
+```
+even if the following parameter name ```customParam``` and parameter value ```From NIFI``` pair
+are added as a dynamic property, they are ignored and the output would be
+```xml
+
+
+
+ Value Selected:
+
+
+```
+In a case where the parameter is not declared in a ```xsl:param``` element, but attempted to be used in an XSLT stylesheet,
+```xml
+
+
+
+
+
+ Value Selected:
+
+
+
+
+```
+even if the following parameter name ```customParam``` and parameter value ```From NIFI``` pair are added as a dynamic property,
+the transform will fail with an error message containing text ```Variable $customParam has not been declared```.
+
+### XSLT Parameter Defined with Required Type
+Starting in XSLT 2.0, an ```as``` attribute was added to parameters allowing for
+specifying the type of parameter. The following are some of the more common types supported and what
+valid values to use for each:
+
+| Type Name | Type Value |
+|:------------------|:-------------------------------------------------------------------------------------------------------------------------|
+| ```xs:string``` | Any string value. |
+ | ```xs:boolean``` | A lowercase value of true or false. |
+| ```xs:integer``` | A signed integer value. |
+| ```xs:float``` | A 32-bit IEEE single-precision floating-point. |
+| ```xs:double``` | A 64-bit IEEE single-precision floating-point. |
+| ```xs:date``` | A date in ISO 8601 format YYYY-MM-DD |
+| ```xs:dateTime``` | A date time in ISO 8601 format: YYYY-MM-DDThh:mm:ss with optional uses of Z to represent UTC or an offset (e.g. -05:00). |
+| ```xs:time``` | A time in format HH:mm:ss or HH:mm:ss.SSS with optional uses of Z to represent UTC or an offset (e.g. -05:00). |
+| ```xs:anyURI``` | A valid URI. |
+
+
+The following XSLT stylesheet demonstrates the use of specifying types in an XSLT
+and populating their values with dynamic properties.
+
+Consider the following XSLT stylesheet
+```xml
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Param of type xs:string value is
+ Param of type xs:integer value is
+ Param of type xs:float value is
+ Param of type xs:double value is
+ Param of type xs:boolean value is
+ Param of type xs:date value is
+ Param of type xs:dateTime value is
+ Param of type xs:time value is
+ Param of type xs:time UTC value is
+ Param of type xs:time offset value is
+ Param of type xs:anyURI
+
+
+
+```
+and the use of the XML from before
+
+```xml
+
+
+ - Some data
+
+```
+
+If the following parameter name and parameter value pairs are added as dynamic properties
+
+| Parameter Name | Parameter Value |
+|:----------------|:----------------------|
+| stringParam | From NIFI |
+| integerParam | 100 |
+| floatParam | 123.456 |
+| doubleParam | 12.78e-2 |
+| booleanParam | true |
+| dateParam | 2026-01-01 |
+| dateTimeParam | 2026-01-01T00:00:00 |
+| timeParam | 12:34:56.789 |
+| utcTimeParam | 12:34:56Z |
+| offsetTimeParam | 12:34:56-05:00 |
+| uriParam | http://from-nifi.com |
+
+
+then the resulting XML will be
+```xml
+
+
+ Param of type xs:string value is From NIFI
+ Param of type xs:integer value is 100
+ Param of type xs:float value is 123.456
+ Param of type xs:double value is 0.1278
+ Param of type xs:boolean value is true
+ Param of type xs:date value is 2026-01-01
+ Param of type xs:dateTime value is 2026-01-01T00:00:00
+ Param of type xs:time value is 12:34:56.789
+ Param of type xs:time UTC value is 12:34:56Z
+ Param of type xs:time offset value is 12:34:56-05:00
+ Param of type xs:anyURI http://from-nifi.com
+
+```
+Please note the "static" attribute added to the ```xsl:param``` element in 3.0
+does not work with the dynamic properties in NIFI because as implied, static means
+a parameter value must be known at compile time of the XSLT while the dynamic
+properties are supplied at run time of the actual transform.
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