Скачать или смотреть How to Create and Retrieve Values from an XSLT 3.0 Map

Learn how to effectively utilize `XSLT 3.0 maps` to retrieve values in your XML transformations. This guide breaks down the process step by step for seamless implementation.
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This video is based on the question https://stackoverflow.com/q/63581567/ asked by the user 'Bryan C.' ( https://stackoverflow.com/u/3347523/ ) and on the answer https://stackoverflow.com/a/63584807/ provided by the user 'Martin Honnen' ( https://stackoverflow.com/u/252228/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Create and Retrieve Values from an XSLT 3.0 Map

XSLT (Extensible Stylesheet Language Transformations) is an essential technology for transforming XML documents. One of the advancements in XSLT 3.0 is the introduction of the map type, which allows developers to handle key-value pairs more efficiently. In this post, we will explore how to create a map in XSLT 3.0 and retrieve string values from it seamlessly.

Understanding the Problem

You may encounter a situation where you're trying to extract information from an XSLT map but run into errors, such as "Fatal Error: Unknown type map." This error indicates that the approach used to access the map's values is incorrect. The goal is to demonstrate how you can correctly create a map and fetch its values effectively.

The question presented is about retrieving values from a map defined in XSLT and understanding if you can create a map element similarly to utilizing the map function.

Solution: Creating and Accessing a Map in XSLT 3.0

Step 1: Defining the Map

Instead of using the XPath function to create a map, you can create a map element directly in XSLT. Here’s how you can define a map using xsl:map and xsl:map-entry:

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This segment of code initializes a map that contains two entries: one with a string value and the other with a number value.

Step 2: Retrieving Values from the Map

To retrieve values from the map, you can use the following format:

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This shows how to access the respective values (pi and foo) that you previously added to the map.

Step 3: Conditional Map Creation

You might want to set up conditions for your map entries based on the availability of documents or other parameters. Here’s an example of how to conditionally create a map:

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In this snippet, the values of navcss and navtype are determined based on whether the specified document is available.

Example Implementation

Here’s how a simple XSLT stylesheet can bring it all together:

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Conclusion

Understanding how to create and retrieve values from a map in XSLT 3.0 is a powerful skill that can enhance your XML transformation capabilities. By leveraging the xsl:map and xsl:map-entry elements, you can build dynamic, conditional maps that meet your specific needs without running into common errors. This approach simplifies data organization and retrieval, providing you with a more efficient way to work with data in your XSLT stylesheets.

Now that you have a clear understanding of how to work with maps in XSLT 3.0, you can begin to implement these techniques in your own projects. Happy coding!