Dataweave Variable Examples

We will use File Connector to take an XML file as input then we will iterate each entry of XML file content using foreach loop of JAXB object. Delivery Methods. Learn vocabulary, terms, and more with flashcards, games, and other study tools. DataWeave Mule Transformation Language 2. It is easy to use the numeric variable. So the relative path was used. Yes, it's as simple as that. Map and List are two common data structures available in Java and in this article we will see how can we convert Map values or Map keys into List in Java. According to all the resources online that I could find, the output-parameter-key tag should make the key 'refcursor' available available for binding and access. Our custSave. The DataWeave engine receives the entire Message which includes not just the payload but all of the inbound properties, outbound properties and the variables which have been explicitly set by the developer prior to the transformer. Obviously, this is a simple example but the ability to reuse this function within a single DataWeave script is unlikely. prepareToLog(msg): This could be very useful function. #[images] C. However, any expression can set the proper context. input1 contain. 0 documentation set in the Mule 3. This is a transformation using concept of Content Enricher Pattern: Below example take 2 payloads that stored in 2 variables (input1, input2). This tip explains the steps to generate a single flat file with multiple header and detail records. In the first part of this series we tackled the issue of defining and also using variables within DataWeave as opposed to using the legacy set "Variable" module. In MySQL, DATE_FORMAT function converts a DATE or DATETIME value to string using the specified format. It also shows how to expose that external API by using APIkit. Date to java. Collibra Connect Hub provides a single self-service API, which facilitates connecting integrations to Collibra DGC and provides the following key benefits:. txt AAA AAB AAC. It goes through the whole set of elements in the input using a mapObject operator. Message format can be XML or JSON or any other program as long as the other programs can understand and communicate. In this post I will demonstrate a use case to extract data using Dataweave. Forgot your password? No schema set while reading payload as flat file. It is not necessary to define an output structure in DataWeave as long as the structure of the data being mapped is compatible with the MIME type defined in the output directive. The File Endpoint in the application polls the input CSV file every ten seconds and processes it. DataWeave can do pretty much anything. This is similar to the above example except that here we are adding the days to the current date instead of given date. org are unblocked. For example you could do a recursive function that return its input incremented by one. Doing it the Java. For example, when the Period is P2M7D (2 months and 7 days), the getDays() method just returns 7, so the months will not be translated to days. This is a transformation using concept of Content Enricher Pattern: Below example take 2 payloads that stored in 2 variables (input1, input2). What is Mule ? Mule ESB (a. For example, you can use a Dataweave expression to set a unique ID based on a unique order ID extracted from a payload so that meaningful information, such as an order number, an employee identification number, or a shipment tracking number, is displayed for the ID of a transaction. json and click Open; you should see the example data for the metadata type. 0 and has been a welcome enhancement providing an order of magnitude improvement in performance as well as increased mapping capability that enables more efficient flow design. DataWeave: Tips and tricks from the field - Kloud Blog. In this tutorial we will learn how to get the index or position of substring in a column of a dataframe in python – pandas. This article gives an example of how to extract the HTTP attachments, read them and write them to local files. Mule MUnit framework makes it very easy to unit test any. The payload contains an array of book objects, one flow variable has a set of currency exchange rates, and the other one a query. In the Package Explorer, right-click the dataweave-with-flow-reference project name, then select Run As > Mule Application. With DataWeave, you transform your data between formats like XML, JSON, CSV, and so on, and perform lookups and functions within your data. Header date format is YY/MM/DD. - [Voiceover] Let's do some examples of the writing expressions with variables exercise. In the example below, we return all of the entries in the array that match with the string in the conditional. This is similar to the above example except that here we are adding the days to the current date instead of given date. And, just as most SQL injection attacks can be thwarted through use of. And the expected plain xml output is below. They retain their values as control passes from one message processor to another. This is a transformation using concept of Content Enricher Pattern: Below example take 2 payloads that stored in 2 variables (input1, input2). As an example of how to create a filename with the date and assign the string to a variable:. A library of DataWeave functions. The basics just aren’t very good. DataWeave code is a JSON like syntax and is format neutral. Viewed 45k times 2 $\begingroup$ This is basic, I know, but I. Other than the FTL squirt routers integrated into the stargates themselves, the most important parts of the interstellar communications infrastructure – and before it the interplanetary communications infrastructure – are each system’s relay stations. The first thing that causes you headaches in all of those languages are dates and how to work with them. Data weave (MuleSoft) 1. - first argument is the name of the flow to be called. x version included in the Mule runtime v3. Anypoint Platform. from a DataWeave transform, you can call a different flow in your Mule application, whatever the flow returns is what the expression returns use the function lookup to execute the flow. Feel free to let me know what you think or any questions, I will be happy to help. 0 documentation set in the Mule 3. With this example, we learned how to consume fixed width text file with DataWeave in Mule 3. You could also write that as 11 plus a. When using DataWeave in Anypoint Studio, it’s not necessary to declare any input directives for any of the components of the Mule Message that arrives to the DataWeave transformer (Payload, flow variables and input/outbound properties) nor for any system variables. Become Job Ready in Anypoint Platform Development Dataweave 2. Inverse of function, containing a fraction. MuleSoft provides exceptional business agility to companies by connecting applications, data, and devices, both on-premises and in the cloud with an API-led approach. Gary Liu's Technical Knowledge Base Thursday, December 21, 2017. In this tutorial, I will introduce you to some knowledge about DataWeave and a simple example on how to use DataWeave to transform data from CSV format to XML format. com is for Java and J2EE developers, all examples are simple and easy to understand, and well tested in our development environment. They stored a local date-time, and since we figured out where they consider local to be, we have something to work with. PriceWeave is a competitive intelligence product for retail. Mule ESB: DataWeave Multi/Different Input Sunday, October 11, 2015 This Example explains about handling Multiple Input (JSON,XML) data using DataWeave component. Click on the 3 dots (…) from the Excel Application Scope to select the excel file. vars : Keyword for accessing a variable, for example, if the name of your variable is myVar, you can access it like this: vars. com related to DataWeave which may be helpful for your need in one way or other. In this flow, the service saves a CSV file with user data and returns a greeting. Doing it the Java. MuleSoft provides exceptional business agility to companies by connecting applications, data, and devices, both on-premises and in the cloud with an API-led approach. for example you may have a HTTP server which understand JSON but it need to talk to some server which only…. For example, due to DataSense we know, that after performing operation Get Posts, the connector returns Json with a specific structure and data types: Also, information about metadata of the connector can be specified using the tab Metadata: DataWeave DataWeave is a language to describe message transformation in Mule flow. If you need more, there are tons of articles on dzone. " Here is an answer example: "A great alternative to explaining your projects is to bring a substantial portfolio with you. Groovy Goodness: Working with Arrays. We only get a lot more methods because of the GDK extensions added to arrays. Mule MUnit framework makes it very easy to unit test any. The README. All about Salesforce Lighting Mulesoft. View the code on Gist. However, any expression can set the proper context. Learn how to partition a list in the spirit of Ruby's and Scala's partition function. The service stores these two parameters. This example application illustrates how to use DataWeave to process an order by looking up some information from an external API. Working in Kovai. Dataweave 2. Global variables are initialized in the header of the DataWeave script and can be referenced by name from anywhere in the body of a DataWeave script. You will gain knowledge to develop, debug and design Mule applications using API and integration. But a subsequent Transform Message can't find 'refcursor' in dataweave. The header of a DataWeave script accepts a var directive that initializes a variable, for example: var language='Español'. 0 documentation set in the Mule 3. The first operand is completely evaluated and all side effects are completed before continuing evaluation of the logical AND expression. 0 in Mule 4. Mule 4 is not only leveraging DataWeave as a transformation language, but expression language as well. Obviously, this is a simple example but the ability to reuse this function within a single DataWeave script is unlikely. This blog explains about Map operator in Dataweave , how to use the map operator. Using Counter from the collections package, we generate a sorted list of tuples, where each tuple is a (word, frequency) pair. 0 Initially i though of constructing %namesapce nso flowvariablehere but unfortunately i was unable make it. Fill in the gaps that exist in the Mule community, by addressing what Java programmers need to know about DataWeave (DW) to become proficient with the language and learn the fundamental difference between Java and DW is the programming paradigm under which they operate. There's a pattern, here: we're starting with an empty object, and populating that object with key:value pairs using each value from the input array: DataWeave DataWeave - Partition List. How to use array in a sentence. But, Thanks to mule's intelligent MEL one doesnt have to write most of the stuff in Java. Set Up and Run the Example. host]” – in the case if the address needs to be withdrawn from flow variables. Mule ESB Interview Questions And Answers. The simple answer is yes. Main difference between. Start studying Mulesoft (module 11: writing DataWeave transformations). In the preview, notice a message is constructed with dynamic variables, and also converting the ETA from a timestamp (2019-01-25T00:00:00. The below code gives an example of how to create an array from a list stored in a variable, and how to acquire the amount of entries in the array. for example you may have a HTTP server which understand JSON but it need to talk to some server which only…. Mule Session And Flow Var Example Posted on the 16 December 2016 by Abhishek Somani @somaniabhi This is simple example in mule demonstrating use of SessionVar , FlowVar , SubFlow , Vm , ForEach ,Groovy and Expression Component. To use other modules, we need to import them by adding the import directive to the head of DataWeave script, for example:. we can actually do it by using an xslt in mule. All source code in Mkyong. There's also a component that can be used to remove the rootMessage variable generated during the interaction of the ForEach. An Overview By: Joshua Erney Recently, I was getting data from a stored procedure that contained a very large amount of whitespace on certain fields but not on others, and, occasionally, those fields were null. " Well you could just have a but if you want 11 more than a, you would wanna add 11 so you could write that as a plus 11. Map has an advantage over other containers by the fact that searching in map, defined by the “key” takes only O(1) time complexity, hence making it useful in various coding fields. Mule) is a lightweight Java-based enterprise service bus (ESB) and integration platform that allows developers to connect applications quickly and easily, enabling them to exchange data. Why is the HTTP response code (or the first line of the HTTP response header) not available in the PHP $_SERVER variable array? Is it a limitation on the way server technology works? A limitation with PHP? With the HTTP protocol? Or maybe I'd be comp. Ab nur 12,00 EUR pro Person. To make it short, i have used a simple example xml that contains a root node with a namesapace, an empty node and another node with few attributes. 8, there has been limited support for reusing DataWeave functions and variables between Transform Message components (the component that applies DataWeave code). Read analyst reports. Utilizing a variable in DataWeave is as easy as using the incoming payload object, we can either drag and drop the values to map. For example, you can use a Dataweave expression to set a unique ID based on a unique order ID extracted from a payload so that meaningful information, such as an order number, an employee identification number, or a shipment tracking number, is displayed for the ID of a transaction. This example is an implementation of the Queueable interface. drop; Drop function will drop first n elements. You could also write that as 11 plus a. These examples are also available from Mulesoft Exchange and can be imported to Anypoint Studio directly. raml is placed in the examples folder in an API specification project. Without DataWeave, my initial reaction would be to use a Message Properties transformation step to set flowVars. For finding the current date and time and setting a default DateTime in DataWeave you need to understand the fields in Context Object Server related to date and time. Read the files from one directory and copy to the other directory using the file connector. In other cases, the full path might be required. Much like the case for not using the legacy components in a flow, when better options exist. Feel free to let me know what you think or any questions, I will be happy to help. In Mule 3 we had Flow variables, Session variables and record variable to store the data inside mule flow. So it says "Write an expression to represent 11 more than a. How DataWeave is used to prepare the payload for the insert into Oracle Here is the snippet of the DataWeave that uses the when/otherwise expression to formats the date field if it is not an empty string and if it is an empty string set the payload field to a null objecct. Before Mule 3. Just assume that variables are immutable in DataWeave. For example, if the parameter id is not passed through the URL, then the whereId flow variable will have an empty string. Generally I would have used a Java component to generate UUID and assign the same to variable in Java itself. This is a transformation using concept of Content Enricher Pattern: Below example take 2 payloads that stored in 2 variables (input1, input2). With this example, we learned how to consume fixed width text file with DataWeave in Mule 3. All about Salesforce Lighting Mulesoft. As an example of how to create a filename with the date and assign the string to a variable:. 000Z) to date (2019-01-25). To achieve this, we need to setup GMail to allow the account to…. you need to import the module or functions you want to use by adding the import directive to the head of your DataWeave script, for example:. Mulesoft is a data integration platform and lightweight Java-based services used in enterprises allowing developers to build, connect applications and devices quickly and connect data and exchange data across the systems and on cloud computing software. For a Mule 3 app, refer to the DataWeave 1. JSON objects are written in key/value pairs. The variable assignment is not necessary to use log,. Use Dataweave for transformations. This is used to define the mappings. The main task of Flow Control component is to take the input Mule event and route it to one or more separate sequences of components. PHP is a popular programming language and the foundation of many smart, data-driven websites. Standard names of components are allowed for transformation. Examples are provided with explanations. XML namespaces associate element and attribute names in an XML document with custom and predefined URIs. The basics just aren’t very good. Creating Dynamic Flows in Mule using Dataweave and Spring - DynamicFlowController. Sometimes two variables in a dataset may convey the same information, except one is a numeric variable and the other one is a string variable. 0 skills beyond those taught in the Anypoint Platform Development - Fundamentals (Mule 4) course or the self-study MuleSoft. For example, we can enrich the payload, or add new headers, attachments to the current message or call out to another processor and assign the result to a flow variable without overwriting the existing payload. As REST APIs are taking over the world, json has stood out and become the de facto data format for APIs. It is a common case in programming when you want to check if specific String contains a particular substring. This Example explains about handling Multiple Input (JSON,XML) data using DataWeave component. Feel free to let me know what you think or any questions, I will be happy to help. In this case I am storing the value into a flow variable which will have the value incremented when the next JMS Message is received. Map has an advantage over other containers by the fact that searching in map, defined by the "key" takes only O(1) time complexity, hence making it useful in various coding fields. In particular, there is currently no direct support for importing modules or libraries of DataWeave code. In this document some best practices and remarks are gathered, which were determined by our engineers during their work on projects, where the integration platform MuleESB is used. My first attempt was to set the JSON request directly using. com related to DataWeave which may be helpful for your need in one way or other. These three hyphens are expected by the DataWeave engine to understand where the transformation actually starts. JSON objects are written in key/value pairs. Java String split method explained with the help of examples: Splitting based on word, multiple characters, special characters, whitespace etc. For example, if there is an inbuilt command of 0101101010 which means reset to the modem then while transmitting we have may want get a data sequence of 001101010010110101011020. It's important that developers are familiar with json data processing. I'm making a web page in ASP. It goes through each JSON book element from the JSON Array input, simply using the map operator. One clear use case for readUrl is for creating a library of DataWeave functions which can be re-used throughout applications. As an example of how to create a filename with the date and assign the string to a variable:. MuleSoft's expression language, DataWeave, is a powerful module a part of the MuleSoft platform. Dataweave 2. If you have any questions or run into any issues, please leave a comment!. myVar Note that a variable in the Mule event is different from variables defined in a DataWeave script, which are local to the script and not accessible outside of it. You can use DataWeave to merge three different payloads into a single one using the service line value. But I also need to remove instances of double-quote characters. My first attempt was to set the JSON request directly using. A modern 'Hello, World' program needs more than just code. foreach loop example in Mule ESB. MuleSoft's Anypoint Platform™ is the world's leading integration platform for SOA, SaaS, and APIs. Mainly these questions are asked, tell your friend to go through these: What is Mule ? Mule ESB (a. MuleSoft Help Center provides MuleSoft forums, resources, training, discussion groups, support and details about the MuleSoft Community. With this example, we learned how to consume fixed width text file with DataWeave in Mule 3. In the first part of this series we tackled the issue of defining and also using variables within DataWeave as opposed to using the legacy set "Variable" module. For the most part, these exercises are derived from my experience as a practitioner, and because of this, it focuses around the language features / functions I use the most: map, filter, mapObject, pluck, groupBy, reduce, and recursion. You can convert java. Apart from syntax changes,. Quickstart for Developers Course Contents (Instructor-supported, online, self-paced) 101. As part of the order processing, some filters and transformations are applied to the order and a final report is created. Need more information? Let's Talk Today! XTIVIA needs the contact information you provide to us to contact you about our products and services. This is used to define the mappings. Dataweave is a new data mapping tool which comes with MuleSoft 3. 0, I will describe how to reuse code with readUrl function. 1) Naming conventions. Set Up and Run the Example. It goes through each JSON book element from the JSON Array input, simply using the map operator. This post will examine the reduce function in the DataWeave (DW) language. An Overview By: Joshua Erney Recently, I was getting data from a stored procedure that contained a very large amount of whitespace on certain fields but not on others, and, occasionally, those fields were null. Viewed 45k times 2 $\begingroup$ This is basic, I know, but I. com is for Java and J2EE developers, all examples are simple and easy to understand, and well tested in our development environment. Today, I need to raise the topic of functions in DataWeave as a key thought when working with MuleSoft has to be "can I reuse this?". Click on the 3 dots (…) from the Excel Application Scope to select the excel file. 7 runtime, Datamapper was there for data mapping. " Well you could just have a but if you want 11 more than a, you would wanna add 11 so you could write that as a plus 11. com IDE? How to create Sandbox? How to make an email template available in lookup How to make approval process active?. - [Voiceover] Let's do some examples of the writing expressions with variables exercise. What is Mule ? Mule ESB (a. Examples are provided with explanations. In this example, we embed the DataWeave library file inside the project, so we give the URL relative to the classpath dwlib/global-functions. Manik Magar. You can add a Logger anywhere in a flow, and you can configure it to log a string that you specify, the output of a DataWeave expression you write, or any combination of strings and expressions. #[flowVars. Mule) is a lightweight Java-based enterprise service bus (ESB) and integration platform that allows developers to connect applications quickly and easily, enabling them to exchange data. If k does not match the key of any element in the container, the function inserts a new element with that key and returns a reference to its mapped value. The example defines a function in the dataweave header and then calls it on the body. Dataweave is a simple, powerful tool to query and transform data inside of Mule. - [Voiceover] Let's do some examples of the writing expressions with variables exercise. 9 documentation. Feel free to let me know what you think or any questions, I will be happy to help. Generating xml namespace in dataweave from a flow variable. 0 (Mule 4) Objectives At the end of this course, students should be able to: Write generalized and reusable transformations using variables, functions, DataWeave modules and mappings, and dynamic evaluation components. Obviously, this is a simple example but the ability to reuse this function within a single DataWeave script is unlikely. This Mulesoft training by LearnOA will help you to become a certified MuleSoft developer. Set Up and Run the Example. OEM Authorized Courseware 100% Money Back Guarantee Real-time code analysis and feedback. " Well you could just have a but if you want 11 more than a, you would wanna add 11 so you could write that as a plus 11. I need to generate a text file using SQL Server Integration Services (SSIS) that has multiple Header Groups and Detail rows for each header group. I’m sure within Kovai. vars : Keyword for accessing a variable, for example, if the name of your variable is myVar, you can access it like this: vars. Java String split method explained with the help of examples: Splitting based on word, multiple characters, special characters, whitespace etc. Now I have a single csv file with variable length columns. Note that the DATE_FORMAT and VARCHAR_FORMAT use different format strings. for example you may have a HTTP server which understand JSON but it need to talk to some server which only…. Example of mule xml:. To use other modules, we need to import them by adding the import directive to the head of DataWeave script, for example:. input1 contain. In Mule 3 we had Flow variables, Session variables and record variable to store the data inside mule flow. Inverse of function, containing a fraction. Below (event. com related to DataWeave which may be helpful for your need in one way or other. But, Thanks to mule's intelligent MEL one doesnt have to write most of the stuff in Java. What is the DataWeave expression to access the images variable? A. And the expected plain xml output is below. but unfortunately i was unable make it. Explaination of Mule Variables along with examples and difference of Flow Variable, Session Variable, Record Variable, Property Basics of DataWeave Transformations in Mulesoft - Duration: 13:15. Array definition is - to dress or decorate especially in splendid or impressive attire : adorn. 9 documentation. #[images] C. Mime Type (mimeType) Optional: It's optional but represents the mime type of the variable. Mule enricher as the name suggests helps use to enrich the existing message. Getting started with DataWeave Part 2. Mule) is a lightweight Java-based enterprise service bus (ESB) and integration platform that allows developers to connect applications together quickly and easily, enabling them to exchange data. In this example, we use the ArrayUtils class, from Apache common third party library to handle the conversion. How to use variables, functions, iterations, formatting options, filtering etc will be explained. "Set Variable Element" implicitly implies that the programmer is trying to set a flow variable during the execution. There is no need to use xpath/XSLT for XML, code for JSON, code for CSV, etc. Below is the output for above dataweave expression Hoping this was useful. DataWeave performs four tasks: Sets a flow variable in the message; Generates output based on evaluating the input; Parses an XML file; Dynamically sets the payload. Mule) is a lightweight Java-based enterprise service bus (ESB) and integration platform that allows developers to connect applications together quickly and easily, enabling them to exchange data. Note: For an additional optional challenge, use Message Enrichers to set this variable without modifying the current message payload. Our custSave. Example 2: Java String contains() method in the if else Loop. 0 %output application/xml --- plus : 2 + 2. So it says "Write an expression to represent 11 more than a. U Development Fundamentals (Mule 4) course. This Transform Message component uses MuleSoft's universal DataWeave transformation language for transforming data from what format to another. Like Fathers Name By Using SQL. Then, it will explain how reduce works, what it expects as arguments, and how those arguments need to be constructed. For example, if there is an inbuilt command of 0101101010 which means reset to the modem then while transmitting we have may want get a data sequence of 001101010010110101011020. However, any expression can set the proper context. Session Variable. Gary Liu's Technical Knowledge Base Thursday, December 21, 2017 In this post I will demonstrate a use case to extract data using Dataweave. It will accept a literal string or DataWeave expression. The files don't have a header. Delivery Methods. Getting started with DataWeave Part 3. How to increment apex:variable? Code for alternate background color for rows in a Conditional Rendered Expression; Chatter Follow/Un-Follow button is missing from th How to run a program in force. Whether your are a manager, developer, architect, administrator, or IT professional find your MuleSoft training and certification path in-person or online from certified MuleSoft professionals. The File Endpoint in the application polls the input CSV file every ten seconds and processes it. 0 %output application/xml --- plus : 2 + 2. For example in Mule 3 XML/CSV data need to be converted into java object to parse or reroute them. Add application logic and handle errors. Any Help would be much appretiated. When using DataWeave in Anypoint Studio, it’s not necessary to declare any input directives for any of the components of the Mule Message that arrives to the DataWeave transformer (Payload, flow variables and input/outbound properties) nor for any system variables. PROCEDURE If we have a Java member that we want to access from DataWeave, let's say a constant defined in a Java class, we cannot invoke them directly from DataWave. In this example, convertionRate variable indicates the conversion rate from dollar to euro. To do this, create a file with. Deploy API implementations and integrations to CloudHub. Almost all of the online examples for DataWeave focus on payload transformation and pass over the fact that a single "Transform Message" component can also output Variables, Session Variables and Properties. Groovy supports arrays just like in Java. Of course, later in our flow, we will need to map our variable back into the payload object to send to our email notification service. Manik Magar. Input Example. Mule) is a lightweight Java-based enterprise service bus (ESB) and integration platform that allows developers to connect applications quickly and easily, enabling them to exchange data. I have to fetch from a flat file & use that string in a sql query but the items in the list are strings so during the fetch i need to fetch it with quotes to use it in oracle. How To Proxy Web Service Using CXF; How To Design RAML Part 2; How To Apply Basic Authentication In RAML; How To Use XPath In MEL; How To Add Proxy Settings To HTTP Requester. The first context will typically be the result of a variable reference expression, payload for example. The DataWeave engine receives the entire Message which includes not just the payload but all of the inbound properties, outbound properties and the variables which have been explicitly set by the developer prior to the transformer. Getting started with DataWeave Part 3. The operands to the logical AND operator need not be of the same type, but they must be of integral or pointer type. If you choose in-person at a Kryterion Testing Centre:. Timestamp by first taking the long millisecond value using the getTime() method of Date class and then pass that value to the constructor of Timestamp object. We will show some examples of how to use regular expression to extract and/or replace a portion of a string variable using these three functions. To use other modules, we need to import them by adding the import directive to the head of DataWeave script, for example:. For the most part, these exercises are derived from my experience as a practitioner, and because of this, it focuses around the language features / functions I use the most: map, filter, mapObject, pluck, groupBy, reduce, and recursion. This Mulesoft training by LearnOA will help you to become a certified MuleSoft developer. I noticed there wasn’t a lot of documentation on it, so this will be a brief overview of my problem and how the using operator helped me. Below (event. < set-variable value = "# on. For those of you, working with DataWeave 1. In the first part, students use Anypoint Platform discover, consume, design, build, deploy, manage, and govern APIs. Here is the input data (I omitted the not-interesting xml data: The Abuse of set-variable. The alternative approach is to use attribute field here the flow variable name was ravi and it's value…. In this post we will look at Mule ESB (MuleSoft) Interview questions. You may also access the README. We can also reference variables defined before the DataWeave component in a Mule flow. But we wanted to achieve using dataweave. This 8-week self-study course is for developers and architects who want to get hands-on experience using Anypoint Platform to build APIs and integrations. Standard names of components are allowed for transformation. Note that it differs from the map operation in that map object processes both key and value of its input, rather than just the keys.