Скачать или смотреть How to Create Multiple Output XML Files with Incremented Names Using XSLT

A comprehensive guide on how to use `XSLT` to transform an XML file into multiple output files, each named sequentially based on existing files in the directory.
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How to Create Multiple Output XML Files with Incremented Names Using XSLT

When working with XML data, it’s common to require flexible output formats for different processing requirements. For developers or data processors who need to generate multiple XML files from a single input, transforming XML using XSLT can be both powerful and efficient. In this post, we'll walk through how to achieve this by outputting multiple XML files with incrementally named file names based on existing files in a specified directory—a common requirement in data automation tasks.

The Problem

You may have a situation where you have an XML file structured similar to this example:

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The goal is to create new XML files for each <letter> tag present, with filenames that are incremented based on the count of existing XML files in your output directory. Consequently, if you already have 10 files, the new files should be called 11.xml, 12.xml, and so forth.

The Current Challenge

While attempting to implement your solution using XSLT, you might encounter an error message stating, "cannot write more than one result document to the same URI". This error typically occurs when the XSLT stylesheet tries to write multiple output files to the same name or path.

The Solution

To solve this problem, you need to correctly structure your XSLT stylesheet to ensure that each resulting XML file has a unique name. Here’s an effective approach using XSLT 2.0:

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Breakdown of the Solution

Step 1: Define the Output Parameters

Output Method: The <xsl:output> element specifies the method of output as XML.

Directory Parameter: The directory where the files will be stored is passed as a parameter.

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Step 2: Count Existing Files

Utilizing the collection() function, the variable $n counts how many XML files already exist in the specified directory:

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Step 3: Create an Incremental Output

Inside the <xsl:template>, you loop through each <letter> element using <xsl:for-each>, and for each letter, a new XML file is generated using <xsl:result-document> with a filename that combines the existing count and the position of the current letter. This ensures unique filenames for each output document:

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Conclusion

With the structured approach outlined above, you can successfully create multiple XML output files from a single input document using XSLT. By managing file names effectively based on existing files, you can streamline operations and facilitate better data handling. This is particularly advantageous in contexts where dynamic file generation is necessary, such as reporting applications, data migration tasks, or batch processing systems.

Now, armed with this knowledge, you can efficiently manipulate your XML data, expanding your skill set in data transformation and automation.