Module helpers 

Functions

is_xsd_anyuri

Returns true if the string is a non-empty anyURI (basic check).

is_xsd_date

Returns true if the string is a valid xsd:date value.

is_xsd_datetime

Returns true if the string is a valid xsd:dateTime value.

is_xsd_gmonthday

Returns true if the string is a valid xsd:gMonthDay value (–MM-DD).