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Document IDS ? wildcard gotcha in CLAUDE.md

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Bruno Postle 2026-02-24 23:41:17 +00:00
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CLAUDE.md
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@ -498,6 +498,29 @@ Use `should_purge: false` to add/update properties without removing existing one
**Known ifctester quirk with boolean applicability filters:** ifctester may flag elements even when their boolean property value does not match the applicability filter (e.g., an `IsExternal=True` wall being matched by an `IsExternal=False` filter). Treat the reported failing elements as authoritative — add whatever the requirement asks for, regardless of whether the applicability logic seems correct. **Known ifctester quirk with boolean applicability filters:** ifctester may flag elements even when their boolean property value does not match the applicability filter (e.g., an `IsExternal=True` wall being matched by an `IsExternal=False` filter). Treat the reported failing elements as authoritative — add whatever the requirement asks for, regardless of whether the applicability logic seems correct.
**`<simpleValue>?</simpleValue>` is NOT a wildcard in ifctester — it matches the literal string `"?"`.**
To check that an attribute has any non-empty value, use an `xs:restriction` pattern instead:
```xml
<!-- WRONG — matches only the literal string "?" -->
<attribute>
<name><simpleValue>Name</simpleValue></name>
<value><simpleValue>?</simpleValue></value>
</attribute>
<!-- CORRECT — matches any non-empty string -->
<attribute>
<name><simpleValue>Name</simpleValue></name>
<value>
<xs:restriction base="xs:string">
<xs:pattern value=".+"/>
</xs:restriction>
</value>
</attribute>
```
This applies to `<attribute>` requirements. The `xmlns:xs="http://www.w3.org/2001/XMLSchema"` namespace must be declared on the root `<ids>` element (it is in the standard IDS template).
### ifcopenshell.validate ### ifcopenshell.validate
Lower-level programmatic validation: Lower-level programmatic validation: