I have two schema files depend each other.
---a.xsd---
<schema version="1.0"
        xmlns="http://www.w3.org/2001/XMLSchema"
        xmlns:c="urn:c"
        targetNamespace="urn:a"
        elementFormDefault="qualified">
    <import namespace="urn:c" schemaLocation="http://c.xsd"/>
    <group name="aa">
        <choice>
            <element ref="c:el"/>
        </choice>
    </group>
</schema>
---c.xsd---
<schema version="1.0"
           xmlns="http://www.w3.org/2001/XMLSchema"
           xmlns:a="urn:a"
           targetNamespace="urn:c"
           elementFormDefault="qualified">
    <import namespace="urn:a" schemaLocation="http://a.xsd"/>
    <element name="el">
        <complexType>
            <group maxOccurs="unbounded" minOccurs="0" ref="a:aa"/>
        </complexType>
    </element>
</schema>

I define schema location uris in an oasis xml catalog file:
<!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
         "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog" 
         xml:base="file:///[path_where_you_saved_xsds]">
    <system systemId="http://a.xsd" uri="a.xsd"/>
    <system systemId="http://c.xsd" uri="c.xsd"/>
</catalog>

I define the catalog file in netbeans. An infinite loop occures while editing an xml like this:
<el
    xmlns="urn:c"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="urn:c http://c.xsd ">
[type '<' here]
</el>

When i use direct filename for all schemaLocation instead of url everything works fine.