is_w3c_prefix

is_w3c_prefix(prefix: str) → bool[source]

Return if the string is a valid prefix under the W3C specification.

Parameters:: prefix – A string
Returns:: If the string is a valid prefix under the W3C specification.

Validation is implemented as a regular expression match against curies.w3c.NCNAME_PATTERN, as defined by the W3C here.

Examples

Strings containig numbers, letters, and underscores are valid prefixes.

>>> is_w3c_prefix("GO")
True

The W3C specification states that the prefix ‘_’ is reserved for use by languages that support RDF. For this reason, the prefix ‘_’ SHOULD be avoided by authors.

>>> is_w3c_prefix("_")
True

Strings starting with a number are not valid prefixes.

>>> is_w3c_prefix("3dmet")

Strings containing a colon or other characters are invalid

>>> is_w3c_prefix("GO:")
False