Is there any method to Extract Numbered Headings with Docx4j?

[Alex-Victor]

I'm trying to extract a text from a docx file using docx4j. So far I can extract all written text and tables, but I'm having problems while extracting numbered headers and lists. such as :
1. Heading 1
text....
1.1 Heading 2
text....
text....
2. Heading 1
text....
2.1 Heading 2
....
Opening a docx file by zip suffix, inside documents.xml, I found that all these headers and lists are inside numPr tags. like this:
<w:numPr>
<w:ilvl w:val="0"/>
<w:numId w:val="2"/>
</w:numPr>
<w:numPr>
<w:ilvl w:val="1"/>
<w:numId w:val="2"/>
</w:numPr>

My expectation is: is there an easy way to get these headers text (1. ; 1.1; a)...)? how can I convert the tags into text?
I'm most appreciative of your help.