Скачать или смотреть How to Compare Elements in Two Arrays with XSLT

Learn how to use XSLT to effectively compare elements between two arrays in XML and generate the desired output structure.
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How to Compare Elements in Two Arrays with XSLT: A Step-by-Step Guide

When working with XML data, particularly for shipping and order processing, you may encounter a need to compare elements from one array with another, especially when totaling items or matching shipment details. In this guide, we'll walk you through how to perform such a comparison using XSLT (eXtensible Stylesheet Language Transformations).

Understanding the Problem

Let's consider a real-world example. You have a set of OrderShipmentItems that describes items shipped, and you need to check these against OrderItems to determine the delivered quantities and associated customer numbers. Your XML data looks something like this:

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In this structure, we want to compare OrderShipmentItems/LineItemNbr with OrderItems/ScheduleLineItems/LineItemNbr and retrieve specific details if they match.

The Solution: Step-by-Step XSLT Transformation

1. Set Up Your XSLT Stylesheet

First, you need to establish an XSLT stylesheet. Here’s how to create a basic structure to get started:

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2. Use Keys for Efficient Matching

Using keys in XSLT will allow you to quickly find and match elements without nested loops, which improves performance and readability.

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3. Iterating Over Elements

You will need to iterate through the OrderItems/ScheduleLineItems to check against OrderShipmentItems. Here’s how you can accomplish this:

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4. Final Output Structure

To output the results in the desired format, the final structure might look like this within your stylesheet:

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Sample Output

When applied to your XML example, your output will resemble this:

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Conclusion

By following these steps, you can effectively compare elements in XML arrays using XSLT. This approach not only streamlines the processing of order and shipment data but also produces a clean, structured XML output that can be further utilized or transformed according to your needs.

Using XSLT might initially seem daunting, but understanding its core functionalities, like using keys and iterating through elements, can make your data manipulation tasks manageable and efficient.

If you need help implementing the steps outlined in this guide or have any further questions, feel free to reach out!