$ pkg-config --list-all
shared-mime-info shared-mime-info - Freedesktop common MIME database
libxcrypt libxcrypt - Extended crypt library for DES, MD5, Blowfish and others
icu-uc icu-uc - International Components for Unicode: Common and Data libraries
icu-i18n icu-i18n - International Components for Unicode: Internationalization library
libxml-2.0 libXML - libXML library version2.
icu-io icu-io - International Components for Unicode: Stream and I/O Library
libcrypt libxcrypt - Extended crypt library for DES, MD5, Blowfish and others
$ go run cmd/html/main.go
2022/07/21 15:29:19 html
2022/07/21 15:29:19 head
2022/07/21 15:29:19 link
2022/07/21 15:29:19 script
...
$ go run cmd/xml/main.go
2022/07/21 15:56:51 feed
2022/07/21 15:56:51 title
2022/07/21 15:56:51 #text
2022/07/21 15:56:51 id
...
$ go run cmd/xsd/main.go
2022/07/21 16:01:03 error: Element 'foo': No matching global declaration available for the validation root.