问如何访问XSDocument元素？

EN

XDocument doc=Xdocument.Load([path]);
XNamespace ns="https://fr7.abbyy.com/FineReader_xml/FineReader10-schema-v1.xml";

var children=doc.Elements().Elements(); //here i get the immediate children, but cant filter 

var documentNode=children.Where(x=>x.Attribute("name").Value=="document").First();

var documentNode=children.Element("document");

var documentNode=children.Element(ns+"document");

<!--This XML file does not appear to have any style information associated with it. The document tree is shown below.-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://www.abbyy.com/FineReader_xml/FineReader10-schema-v1.xml" targetNamespace="http://www.abbyy.com/FineReader_xml/FineReader10-schema-v1.xml" elementFormDefault="qualified">
  <link type="text/css" id="dark-mode" rel="stylesheet" href=""/>
  <style type="text/css" id="dark-mode-custom-style"/>
  <xs:annotation></xs:annotation> 
  <xs:element name="document"><xs:element>   ----how do i get this one
  <xs:complexType name="something"></xs:complexType>
</xs:schmea>