Скачать или смотреть Grouping Line Items in XSLT 1.0: A Practical Guide to Non-Identical Line Items

Discover how to group invoice line items based on parent line number using XSLT 1.0. This step-by-step guide breaks down the solution for efficient XML transformations.
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Grouping Line Items in XSLT 1.0: A Practical Guide to Non-Identical Line Items

When dealing with invoice data in XML format, a common challenge arises: how to organize line items in a coherent and structured way. You may often need to group line items based on specific conditions, all while using XSLT 1.0 for transformation. In this post, we’ll explore the problem of grouping invoice line items based on parentLineNumber and how to exclude certain line items from the final grouping.

The Problem

You have the following requirements for XML transformation:

Group line items based on parentLineNumber.

Exclude invoice line items from the output when the ParentLineNumber and LineNumber are the same, but only if the group contains more than one invoice line item.

Sample Input

To illustrate the problem, consider the below XML structure representing an invoice:

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

In this case, you want to group the line items effectively while following the aforementioned conditions.

The Solution

To achieve this transformation, we can utilize XSLT 1.0, focusing on grouping and criteria-based filtering. Here’s an efficient template that fulfills the requirements:

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

Explanation of the Code

Key Declaration: The key is defined to match InvoiceLineItem elements based on their parentLineNumber. This allows us to refer to grouped items easily.

Main Template: The main template matches the InvoiceNotification element and starts building the output.

First xsl:for-each Loop: This loop processes each InvoiceLineItem, grouping them by parentLineNumber. It filters groups to ensure only unique parent numbers with more than one line are counted.

Second xsl:for-each Loop: This nested loop selects invoices based on the defined rules of exclusion. Here, it skips line items when their LineNumber matches their parentLineNumber if they are in groups of size greater than one.

Expected Output

When you apply the above XSLT transformation to the sample input, the resulting XML will look like this:

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

As you can see, the line item corresponding to PK06 was ignored as expected.

Conclusion

Grouping based on specific conditions in XSLT 1.0 is entirely possible with the right approach. This guide not only demonstrates how to effectively group invoice line items based on parentLineNumber but also provides a useful tool for filtering out unnecessary duplicates based on predefined criteria.

By following the outlined steps and code, you should be well-equipped to handle similar challenges in your XML transformations.