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SEO: XSL article, SoftwareApplication schema, improve testing article
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alexandrev-tibco
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---
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title: "XSL online tester: run XSL and XSLT transforms in your browser"
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description: "Free XSL online tester and editor. Run XSL transformations, test XSLT stylesheets and validate XSL-FO output without installing anything."
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date: 2026-04-13T00:00:00Z
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tags: ["xsl", "xslt", "online", "tools"]
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---
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XSL (Extensible Stylesheet Language) is an umbrella term that covers three related specifications: XSLT for transformations, XPath for node selection, and XSL-FO for formatting objects. When developers search for an "XSL tester" or "XSL online editor", they are usually looking for a way to run XSLT stylesheets against XML input without a local install. [XSLT Playground](https://xsltplayground.com) does exactly that.
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## XSL vs XSLT — what is the difference?
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**XSL** is the full family of W3C specifications:
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- **XSLT** (XSL Transformations) — transforms XML documents into other formats
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- **XPath** — the path language used inside XSLT to navigate XML trees
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- **XSL-FO** (XSL Formatting Objects) — describes page layout for print and PDF output
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In practice, when people say "XSL" in an integration or development context, they almost always mean **XSLT**. The stylesheet file extension `.xsl` and `.xslt` are interchangeable — Saxon and most processors accept both.
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## Running XSL transforms online
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[XSLT Playground](https://xsltplayground.com) supports XSLT 1.0, 2.0, and 3.0 via the Saxon processor. To run an XSL transform:
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1. Paste your XML source document in the input panel
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2. Paste your XSL stylesheet in the stylesheet panel
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3. Select the XSLT version (1.0, 2.0 or 3.0)
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4. Click **Run**
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The output appears immediately. If the stylesheet has errors, the error panel shows the exact line and message from Saxon.
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## Common XSL use cases
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**XML to HTML** — the most common use. An XSL stylesheet walks an XML document tree and emits HTML tags:
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```xml
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<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
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<xsl:output method="html"/>
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<xsl:template match="/">
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<html><body>
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<xsl:apply-templates select="//item"/>
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</body></html>
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</xsl:template>
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<xsl:template match="item">
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<p><xsl:value-of select="name"/></p>
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</xsl:template>
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</xsl:stylesheet>
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```
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**XML to XML** — reshaping or filtering a document structure:
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```xml
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<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
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<xsl:output method="xml" indent="yes"/>
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<xsl:template match="/">
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<output>
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<xsl:copy-of select="//product[price > 100]"/>
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</output>
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</xsl:template>
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</xsl:stylesheet>
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```
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**XML to plain text or CSV** — using `xsl:output method="text"`:
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```xml
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<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
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<xsl:output method="text"/>
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<xsl:template match="/">
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<xsl:for-each select="//row">
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<xsl:value-of select="string-join((col1, col2, col3), ',')"/>
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<xsl:text> </xsl:text>
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</xsl:for-each>
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</xsl:template>
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</xsl:stylesheet>
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```
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## XSL file extensions: .xsl vs .xslt
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Both `.xsl` and `.xslt` are valid. The `.xsl` extension is older and more common in enterprise systems (SAP, Oracle, IBM DataPower). The `.xslt` extension is more explicit. Saxon accepts either. XSLT Playground accepts any content regardless of what you call it.
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## Testing XSL stylesheets online
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The main advantage of an online XSL tester is speed of iteration. You can:
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- Paste a real XML payload from a production system and see what the stylesheet produces
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- Add parameters and test different code paths
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- Enable trace mode to see which templates fired and in what order
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- Export the entire test case (input + stylesheet + parameters) as a JSON workspace to share with a colleague
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All of this is available at [XSLT Playground](https://xsltplayground.com) without creating an account or installing anything.
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## XSL transform online vs local Saxon
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For most development and debugging tasks, the online tester is faster than running Saxon locally. Use local Saxon when:
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- You are processing confidential data that cannot leave your network
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- Your input files are very large (several MB or more)
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- You need to integrate the transform into a build pipeline
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For everything else — prototyping, debugging, sharing test cases — the online XSL tester is quicker.
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@@ -1,9 +1,12 @@
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---
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title: "Testing XSLT transforms for regression safety"
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description: "How to build a lightweight test harness for reliable XSLT deployments."
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title: "XSLT testing: how to build a regression harness for safe deployments"
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description: "How to test XSLT stylesheets and catch regressions before they hit production. Covers test corpus setup, expected outputs, CI integration, and using an online XSLT tester."
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date: 2024-11-26T00:00:00Z
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tags: ["xslt", "testing", "debugging"]
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---
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Testing XSLT stylesheets before deployment prevents silent regressions in integration flows. Whether you run transforms in MuleSoft, Tibco, IBM DataPower, or a custom Saxon backend, a reproducible test process catches breaking changes before they reach production. This guide shows how to set one up, and how an online XSLT tester speeds up the feedback loop.
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XSLT transformations often live at the heart of an integration flow. A small change can impact downstream systems, and because the output is just data, regressions can go unnoticed until a business process breaks. You do not need a massive testing framework to prevent this. A lightweight, repeatable testing approach with a few representative inputs can catch most issues and make changes far safer to deploy.
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Start by curating a compact test corpus. Choose a handful of XML inputs that represent the most important scenarios: a normal case, a case with missing optional elements, a case with unexpected or additional fields, and a case with edge values such as empty strings or special characters. Keep these documents small and focused so you can understand the expected output at a glance. Store them alongside the stylesheet to keep the transformation and tests tightly connected.
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@@ -10,6 +10,7 @@
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<meta property="og:description" content="{{ with .Description }}{{ . }}{{ else }}{{ .Site.Params.subtitle }}{{ end }}">
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<meta property="og:type" content="{{ if .IsPage }}article{{ else }}website{{ end }}">
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<meta property="og:url" content="{{ .Permalink }}">
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{{ partial "schema-app.html" . }}
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{{ partial "adsense/head.html" . }}
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<link rel="stylesheet" href="{{ "css/main.css" | relURL }}">
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</head>
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@@ -0,0 +1,26 @@
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<script type="application/ld+json">
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{
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"@context": "https://schema.org",
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"@type": "SoftwareApplication",
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"name": "XSLT Playground",
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"url": "https://xsltplayground.com",
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"description": "Free online XSLT editor, tester and validator. Run XSLT 1.0, 2.0 and 3.0 transformations in your browser using Saxon. No install required.",
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"applicationCategory": "DeveloperApplication",
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"operatingSystem": "Any",
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"offers": {
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"@type": "Offer",
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"price": "0",
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"priceCurrency": "USD"
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},
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"featureList": [
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"XSLT 1.0, 2.0 and 3.0 support",
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"Saxon-powered backend",
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"Real-time XML transformation",
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"XSLT validator with detailed error messages",
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"Multiple workspaces",
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"Execution trace and debugging",
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"Multiple XML inputs and parameters",
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"Import/Export workspaces as JSON"
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]
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}
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</script>
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