The recommendation doesn't stop there, however. These extensions take the form of extension functions, which are used in a way similar to XPath functions; and extension elements, which provide even more functionality.
Suppose you have an XML file that contains commerce information, and you want to transform it into a summary of orders. Unfortunately, the XML file doesn't actually contain any customer information. Instead, it contains a customer identifier that refers back to a database. This article will chronicle the building of a style sheet that uses extension functions and elements to allow calculations and a call to an external function that would, in a production application, return the customer information.
You can also download the source file and style sheet here , along with a command line script to execute the transformation. Let's start with a look at where we're starting out, and where we're going. The original XML file contains just the basics, as shown in Listing 1. The end result is a Web page that shows each order, including the extended price for each item and the customer information, as shown in Listing 2 and Figure 1. Figure 1 The final result. The extended prices and order total will come from extension functions, and the customer information will be provided by an extension elements.
We'll also use extension elements to "zero out" the totals between orders. We'll start by putting together the basic style sheet, with placeholders for the extensions. The overall format is laid out in Listing 3. Now let's add in the extensions to see how they're used. Later, we'll define the functionality that goes behind them. We'll start with the extension function. XPath has a number of built-in functions, such as round and concat. These functions can take XPath expressions as arguments, and because they themselves are XPath expressions, we output them using the value-of element.
For example, we could round off prices to the nearest dollar using the round function:. In this same way, we can add a new function, which we'll define later, as shown in Listing 4. Here, we defined two functions: totalCost , which takes no arguments; and getExtPrice , which takes as arguments the quantity and price children. The getExtPrice function also updates the running total value, representing the total cost of the order.
XPath normally converts elements to text values, but eventually we'll want to perform arithmetic on them, so we'll use XPath's built-in number function to change their type before passing them to the script. Both functions have a namespace prefix, totalSys , to tell the processor that we're not dealing with built-in functions.
The namespace itself doesn't matter, as long as it's unique. Ultimately, the processor will output the values returned by these functions just as if it were one of the built-in functions. The purpose of an extension element is a bit different from that of a function. Although an extension element can return a value for output, elements are usually used more to cause something to be done.
For example, we have two things that we want done: We want to retrieve the customer information from the database, and we want to reset the order total for each order. The elements are added in Listing 5. In the first case, we're simply going to return customer information. In the second, we're using a custom attribute to pass information to the script. This element won't actually output any information, but it will reset the running total for each order.
Now, all we need is a way to tell the processor what it's supposed to do when it encounters these extensions. I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time. Pearson Education, Inc. This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.
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The maximum size of files that can be uploaded is determined by the Organization. MaxUploadFileSize property. This property is set in the Email tab of the System Settings in the Dynamics application. This setting limits the size of files that can be attached to email messages, notes, and web resources. The default setting is 5 MB. You can use ten file formats to create web resources.
The following table lists each file format, the allowed file extensions, and the type value that you use for each. The following sample shows how to use it. The Xrm. To enable this, we recommend that you use a consistent naming convention for the web resources that reflect a virtual file structure.
From another web resource, you should always use relative URLs to reference each other. When a user belongs to more than one organization on a server, this path will always refer to the users default organization. The application will process this URL and return the file that contains the latest version of the web resource. This URL will look like this:. The version value is updated when you publish customizations and ensures that the browser uses the latest cached version of the web resource.
Because of this, use a relative path to a web resource, the Xrm. When you write code to reference a web resource that works for Dataverse, you should use the getClientUrl function. A web resource control configured to use a certain number of rows will have different heights in a Unified Client application compared to a web client application. This is because there is a difference in the height of a row between Unified Interface and web client.
If a form is needed in both the web client and Unified Interface, you can use different forms in the Unified Interface app and the web client app with the control configured to use the appropriate number of rows in each form. Please see the Developer tools topic for community developed tools. The community tools are not a product of Dataverse and does not extend support to the community tools. If you have questions pertaining to the tool, please contact the publisher.
The language design is inspired by jq, XPath, and XQuery. Inspired by the 'location path' semantics of XPath 3. Provides a recursive, pattern-matching approach to transforming JSON data. Transformations are defined as a set of rules which match the structure of a JSON object. When a match occurs, the rule emits the transformed data, optionally recursing to transform child objects. It is a single-file node. Jsawk is like awk, but for JSON.
Otherwise you'll end up having to design a parser for your own custom templating language. Having walked through that path, I can tell you that it's not pretty. Update Nov 12, : After a couple of weeks working on my parser, I've been able to optimize it. Templates are parsed beforehand and commands are stored as JSON objects.
The code is around 1K lines for the editor it's for a private project so I can't share it and around lines for the JSON transformation code includes iteration commands, simple comparisons, template calling, variable saving and evaluation. I plan to release it under a MIT license. Drop me a mail if you want to get involved. As yet another new answer to an old question, I'd suggest a look at DefiantJS. The "Templating" section of the documentation includes this example:.
There is now! I recently created a library, json-transforms , exactly for this purpose:. This transform is composed of three rules. The first matches any automobile which is made by Honda, emitting an object with a Honda property, then recursively matching.
Verson 3 of XPath 3. This seems to be available in the commercial version of Saxon, and might at some point be included in the HE version. I would want the transformation scripts to be external from the tool, text based, and preferably a commonly used language. I wonder if SQL could be a suitable alternative. Just some thoughts so far. Not too sure there is need for this, and to me lack of tools suggests lack of need.
Just with normal assignments or set, get , looping and so on. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 11 years, 9 months ago. Active 4 days ago. Viewed k times. Improve this question.
StaxMan XSLT is a standard that has actual implementations in many languages and platforms, my questions targets a similar endeavor. NicolasLeThierryd'Ennequin Agreed. The XML ecosystem of tools is also heavy on Java devs, which turns away even more people.
I would love a JSON equivalent! I strongly disagree with the closing of this answer. Show 10 more comments. Active Oldest Votes. Interesting idea.