Скачать или смотреть A Complete Guide to XSLT Grouping and Total Calculation in XML

Learn how to effectively use XSLT for grouping descriptions, calculating weights, and summing totals in XML. Follow our guided steps for accurate results.
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This video is based on the question https://stackoverflow.com/q/69785325/ asked by the user 'Akash' ( https://stackoverflow.com/u/10677925/ ) and on the answer https://stackoverflow.com/a/69797766/ provided by the user 'Vasyl Krupa' ( https://stackoverflow.com/u/14902377/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering XSLT Grouping and Total Calculation

When dealing with XML data, especially one that needs to be transformed through XSLT, you might run into challenges like grouping descriptions, calculating weights, and summing totals. If you find yourself in a similar situation as Akash, who is struggling to group items correctly and calculate their total weight, this guide will help you understand the process step-by-step.

The Problem

As per Akash's requirements, he needs to:

Group item descriptions for those with ItemLevel = 3.

Calculate the weight for each item based on the first occurrence and sum up the total quantities for matching ItemTypes.

Generate a total that reflects the sum of all weights.

An instance of Akash’s current output shows discrepancies when compared to the expected outcome—where he ended up with incorrect totals and grouped data.

Current Output:

Descp: Weight:

Pencil 400

Box 800

Carton 200

Total 700

Expected Output:

Descp: Weight:

Pencil 100

Clock 300

Box 400

Pen 200

Carton 200

Total 1200

The Solution

To solve Akash’s issue, we will design a robust XSLT transformation that groups item types, calculates weights based on their quantities, and results in the correct total.

Key Steps

Define the XML Structure: Start with the provided XML, ensuring that it is formatted correctly and includes necessary attributes like ItemLevel, ItemType, and dispatch quantities.

Create the XSLT Stylesheet: Below is a sample XSLT template that performs the required operations:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Template Matching: The main template matches the root XML structure and sets up a table layout for output.

Grouping with xsl:apply-templates: The xsl:apply-templates command processes each Item meeting the ItemLevel='3' condition.

Weight Calculation: In the Items template, the weight is calculated by multiplying the unit net weight by the dispatch quantity.

Summing Total: Finally, the total weight is calculated using sum() function to aggregate the results, ensuring accurate totals are displayed at the end of the output.

Conclusion

By understanding the structure of your XML and carefully structuring your XSLT, you can effectively resolve issues with grouping and summing totals. The provided template is a comprehensive solution to the scenario Akash faced, and can be adapted for similar challenges.

With this guide, you should now be equipped to tackle your XSLT problems confidently. Happy coding!