Lemminx not able to fetch my dtd file

I am trying to use Lemminx to validate my fontconfig XML file. However, it keeps throwing the error that it cannot find the DTD file. fonts.dtd is a systemwide file on Linux machines and is located in /usr/share/xml/fontconfig/fonts.dtd. Is there any way I can tell Lemminx to recognize the fontconfig urn?

Could you please let me know how I can fix this?

[angelozerr]

Glad you fixed yoir issues.

Thnank you for your feedback and I hope you will continue to enjoy with lemminx.

[fbricon]

You need to define a catalog that maps urn:fontconfig:fonts.dtd to /usr/share/xml/fontconfig/fonts.dtd. So, first create a catalog.xml on your machine, containing:

<!DOCTYPE catalog
    PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
    "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog" prefer="public">
    <system systemId="urn:fontconfig:fonts.dtd" uri="/usr/share/xml/fontconfig/fonts.dtd" />
</catalog>

You then need to pass the following setting to lemminx:

"xml.catalogs": [ "/path/to/catalog.xml"]