addProperty – Add a property and its value, or name-value pair, to a JSON object, and return the updated object. string – Return the string version for an input value. The Workflow Management Coalition, founded in August 1993, began by defining the Workflow Reference Model (ultimately published in 1995) that outlined the five key interfaces that a workflow management system must have. By 1998, the first standards based on XML began to appear. It always results in another JSON value. dataUriToString – Return the string version for a data URI. not – Check whether an expression is false. In this blog post, we have seen a detailed view on the Logic App Expressions and the Workflow Definition Language in Azure Logic Apps.

Interface 1 was for defining the business process, which includes two aspects: a process definition expression language and a programmatic interface to transfer the process definition to/from the workflow management system.

base64ToString – Return the string version for a base64-encoded string. uriHost – Return the host value for a URI. But my e-mail just shows  "concat string is @concat('hello','world')"   , instead of hello world. replace – Replace a substring with the specified string and return the updated string. addMinutes – Add several minutes to a timestamp. getPastTime – Return the current timestamp minus the specified time units. In a workflow definition, expression can be used anywhere in a JSON string value by prefixing the expression with the at-sign ‘@’.

greater – Check whether the first value is greater than the second value.

What does WPDL stand for? These functions work only on strings. XPDL 1.0 was ratified by the WfMC in 2002, and was subsequently implemented by more than two dozen workflow/BPM products to exchange process definitions.

addSeconds – Add several seconds to a timestamp. Whenever a Logic App is created, it has an underlying workflow definition that describes the actual logic that runs in the Logic App. It is possible to say that XPDL is the XML Serialization of BPMN. To get these values or process the values in these expressions, functions provided by workflow definition language can be used. triggerOutputs – Return a trigger’s output at runtime, or values from other JSON name-and-value pairs. In spring 2012, the WfMC completed XPDL 2.2 as the fifth revision of this specification. The workflow definition includes a trigger for instantiating the Logic App and one or more actions that run after the trigger fires. decodeBase64 – Return the string version for a base64-encoded string. action – Return the current action’s output at runtime, or values from other JSON name-and-value pairs. listCallbackUrl – Return the “callback URL” that calls a trigger or action. concat string is @concat('hello','world')"   , instead of hello world.

For new users who are unfamiliar with the expression language, there is an inline help experience that shows how to … rand – Return a random integer from a specified range.

Based on the result, return a specified value. lastIndexOf – Return the starting position for the last occurrence of a substring.

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