IfcXML output has "<ifc:uos>" element. As the IFC namespace is declared as default, the "ifc" prefix cannot be resolved.
It should simply be "<uos>"
<?xml version="1.0" encoding="utf-8"?>
<ex:iso_10303_28 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ex="urn:iso.org:standard:10303:part(28):version(2):xmlschema:common" xsi:schemaLocation="urn:iso.org:standard:10303:part(28):version(2):xmlschema:common ex.xsd" version="2.0">
<ifc:uos id="uos_1" description="" configuration="i-ifc2x3" edo="" xmlns="http://www.iai-tech.org/ifcXML/IFC2x3/FINAL" xsi:schemaLocation="http://www.iai-tech.org/ifcXML/IFC2x3/FINAL ifc2x3.xsd">
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diff
Ifc/src/org/bimserver/ifc/xml/writer/IfcXmlSerializer.java
51c51
< printLineTabbed("<ifc:uos id=\"uos_1\" description=\"\" configuration=\"i-ifc2x3\" edo=\"\" xmlns=\"http://www.iai-tech.org/ifcXML/IFC2x3/FINAL\" xsi:schemaLocation=\"http://www.iai-tech.org/ifcXML/IFC2x3/FINAL ifc2x3.xsd\">");
---
> printLineTabbed("<uos id=\"uos_1\" description=\"\" configuration=\"i-ifc2x3\" edo=\"\" xmlns=\"http://www.iai-tech.org/ifcXML/IFC2x3/FINAL\" xsi:schemaLocation=\"http://www.iai-tech.org/ifcXML/IFC2x3/FINAL ifc2x3.xsd\">");
64c64
< printLineTabbed("</ifc:uos>");
---
> printLineTabbed("</uos>");