XSLT Error Reference

XTDE1490

XSLT 2.0+ XSLT dynamic error

Error message

Cannot write more than one result document to the same URI

Two xsl:result-document instructions resolved to the same output URI — usually a static href inside a loop. Make the href dynamic.

What it means

xsl:result-document writes an output file per invocation. If two invocations produce the same href, the second would overwrite the first — the spec forbids it and Saxon raises XTDE1490.

Common causes

Static href inside xsl:for-each — every iteration writes to the same name:

<!-- Before: every customer writes to out.xml → XTDE1490 -->
<xsl:for-each select="customer">
  <xsl:result-document href="out.xml">…</xsl:result-document>
</xsl:for-each>

<!-- After: unique URI per iteration -->
<xsl:for-each select="customer">
  <xsl:result-document href="customer-{@id}.xml">…</xsl:result-document>
</xsl:for-each>

Duplicate keys in the data — href="{@id}.xml" with two equal @id values. Deduplicate first (xsl:for-each-group group-by="@id").
Writing to the principal output URI while also producing normal output.

How to fix it

Build the href from something guaranteed unique: a key from the data, position(), or generate-id(). See xsl:result-document for the full syntax and a runnable example.

Reproduce & fix it in XSLT Playground →

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