fuse xslt namespace into HTML

[sashafirsov]

The HTML parser implementation would treat DCE content as Foreign element. In HTML5 the namespaces are ignored and few non-HTML markups (SVG and MathML) with own schema are blended into HTML parser itself as native HTML elements.

After completion, XSLT tags need to be added to https://github.com/EPA-WG/dce-parser

[sashafirsov]

https://www.w3.org/1999/11/xslt10.dtd should be the source for

• XSL elements listing in DCE
• XSL elements definitions for IDE( IntelliJ, VS Code )

Multiple DTD parser implementations exist for java, and few in JS 1, 2.

The generation script would read the DTD file and generate files ^^

[sashafirsov]

implemented.