How to replace an "import" declaration inside an XML schema, by the contents of the XSD to be imported? [closed]

I have the following XML Schema tag:

<xsd:import namespace="http://www.w3.org/2000/09/xmldsig#"
    schemaLocation="xmldsig-core-schema20020212.xsd" />

And I'd like to know how to replace this import with its value in the XSD being imported. That is, instead of having two XSD schemas, just create one file. Simply "playing" the content inside the other does not solve because I have already tried, so as not to declare another tag <xsd:schema...> .