Functions operating on strings

• Getting length of a string with string-length function
• Testing for a substring in a string with contains function
• Comparing starts and ends of strings
• Comparisons of two strings with function compare
• Comparisons of two strings with operators
• Extracting substrings with substring function
• Extracting substring with substring-before and substring-after functions
• Transforming strings to lowercase and uppercase
• Replacing characters in strings with translate function
• Normalization of whitespace characters in a string with normalize-space function
• Joining strings with concat
• Joining strings with string-join
• Absolute URIs' from relative ones with resolve-uri function
• Escaping of URI with encode-for-uri, iri-to-uri, and escape-html-uri
• Strings from unicode codepoints