JetBrains Rider 2021.2 Help

Code Inspections in XPath

This topic lists all JetBrains Rider code inspections available in XPath.

You can toggle specific inspections or change their severity level on the Editor | Inspection Settings | Inspection Severity | Other Languages page of the IDE settings Ctrl+Alt+S.

InspectionDescriptionDefault Severity
Hardcoded namespace prefix



Reports comparison of the name() function with a string that contains a colon (:). Such usages usually indicate a hardcoded namespace prefix in the comparison. As a result, the code will break when run against XML that uses another prefix for the same namespace.

Example:

<xsl:if test="name() = 'xlink:href'">...<xsl:if>

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Warning Warning
Implicit type conversion



Reports an implicit conversion among the predefined XPath-types STRING, NUMBER, BOOLEAN, and NODESET. Helps to write XSLT scripts that are more expressive about types and prevents subtle bugs:

Example:

<xsl:if test="foo" /> is not the same as <xsl:if test="string(foo)" />

The first test checks whether the element "foo" exists (count(foo) > 0); the latter one however is only true if the element actually contains any text (string-length(foo) > 0). Suggests making the type conversion more explicit.

Use the controls below to customize the inspection.

  • Enable or disable implicit conversions between certain types

  • Always report explicit conversions that do not result in the actually expected type, for example, <xsl:if test="number(foo)" />

  • Ignore conversion from NODESET to BOOLEAN by using the string() function as a shortcut for writing string-length() > 0.



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Warning Warning
Redundant type conversion



Reports a type conversion with a string(), number(), or boolean() function where the type of the argument is the same as the function's return type or if the expected expression type is any. Suggests removing the unnecessary conversion.

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Warning Warning
Unknown element or attribute name



Reports the name of an element or an attribute that is used in an XPath-expression but is missing in the associated XML file and is not defined in the referenced schema. This prevents problems caused by typos in XPath-expressions that otherwise occur when running the script and may even happen not to be recognized immediately.

Example:

<xsl:template match="h:txtarea" />

If the h is bound to the XHTML namespace, the inspection will report this part of the match expression as an unknown element name because the correct name of the element is "textarea".

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Warning Warning
XPath predicate with index 0



Reports accidental usage of zero in a predicate index or in a comparison with the function position(). Such usage is almost always a bug because in XPath, the index starts at one, not at zero.

Example:

//someelement[position() = 0] or //something[0]

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Warning Warning
Last modified: 16 July 2021