XML parsing and NULL children

Hi,
I'm trying to parse an xml file, but I receive the message "WARNING: URL
[filename] does not contain text"...
When I put a watch on a filter, every node found has id and attributes, but
the children still null...

The code is really simple, the xml is well formed and have a dtd. Someone
knows what I'm doing wrong?
Thank you very much,
Francesco

------------------------- java code --------------------------
     public FilterSet setBaseValues(String siteXMLName) throws
ParserException {
        NodeFilter singleFieldFilter=new TagNameFilter("field");
        NodeFilter multipleFieldFilter=new TagNameFilter("field_list");
        NodeList singleFieldList=new NodeList();
        NodeList multipleFieldList=new NodeList();

        Parser parser=new Parser("./"+siteXMLName);
        for (NodeIterator e = parser.elements(); e.hasMoreNodes();) {
            Node node = e.nextNode();
            node.collectInto(singleFieldList, singleFieldFilter);
            node.collectInto(multipleFieldList, multipleFieldFilter);
        }
}
------------------------------------------------------------------

------------------------- try.xml content ----------------------
<?xml version="1.0"?>
<!DOCTYPE site SYSTEM "hsh.dtd">
<site>
    <field id="image" type="attribute">
        <caption>a caption</caption>
        <attribute>src</attribute>
    </field>
    <field id="description" type="text">
        <caption>text text</caption>
    </field>
    <field_list list="parent_name" type="text">
        <caption>another caption</caption>
        <names>
            <name id="field1">Field 1</name>
            <name id="field2">Field 2</name>
        </names>
    </field_list>
</site>
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