is there a way to retrieve only the immediate children found by a call to DOMElement::getElementsByTagName? For example, I have an XML document that has a category element. That category element has sub category elements (which have the same structure), like:

```
<category>
    <id>1</id>
    <name>Top Level Category Name</name>
    <subCategory>
        <id>2</id>
        <name>Sub Category Name</name>
    </subCategory>
    ...
</category>

```

If I have a DOMElement representing the top level category, 

```
$topLevelCategoryElement->getElementsByTagName('id');

```

will return a list with the nodes for all 'id' elements, where I want just the one from the top level. Any way to do this outside of using XPath?