Where to find the schema (.xsd file) for Microsoft docx format

Where to find the schema (.xsd file) for Microsoft docx format

Consider a user that needs a text of docx document without the headers and
footers for processing in R.
If a file.docx is renamed as file.zip and the document document.xml is
analyzed - it is a well formed XML document with the text.
Did Microsfot (or other developer) publish a schema for this document.xml
subfile in the ZIP package of docx file?
The file looks like this:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
- <w:document
xmlns:wpc="http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"
xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"
xmlns:v="urn:schemas-microsoft-com:vml"
xmlns:wp14="http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing"
xmlns:wp="http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing"
xmlns:w10="urn:schemas-microsoft-com:office:word"
xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main"
xmlns:w14="http://schemas.microsoft.com/office/word/2010/wordml"
xmlns:wpg="http://schemas.microsoft.com/office/word/2010/wordprocessingGroup"
xmlns:wpi="http://schemas.microsoft.com/office/word/2010/wordprocessingInk"
xmlns:wne="http://schemas.microsoft.com/office/word/2006/wordml"
xmlns:wps="http://schemas.microsoft.com/office/word/2010/wordprocessingShape"
mc:Ignorable="w14 wp14">
- <w:body>
- <w:p w:rsidR="00F447D7" w:rsidRPr="00C63308" w:rsidRDefault="00F447D7">
- <w:pPr>