| encoding/xml | Package xml implements a simple XML 1.0 parser that understands XML name spaces. |
| flag | Package flag implements command-line flag parsing. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| golang.org/x/text/cases | Package cases provides general and language-specific case mappers. |
| golang.org/x/text/language | Package language implements BCP 47 language tags and related functionality. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| regexp | Package regexp implements regular expression search. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| text/template | Package template implements data-driven templates for generating textual output. |