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diff --git a/pygments/lexers/rdf.py b/pygments/lexers/rdf.py
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-# -*- coding: utf-8 -*-
-"""
-    pygments.lexers.rdf
-    ~~~~~~~~~~~~~~~~~~~
-
-    Lexers for semantic web and RDF query languages and markup.
-
-    :copyright: Copyright 2006-2019 by the Pygments team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-"""
-
-import re
-
-from pygments.lexer import RegexLexer, bygroups, default
-from pygments.token import Keyword, Punctuation, String, Number, Operator, Generic, \
-    Whitespace, Name, Literal, Comment, Text
-
-__all__ = ['SparqlLexer', 'TurtleLexer', 'ShExCLexer']
-
-
-class SparqlLexer(RegexLexer):
-    """
-    Lexer for `SPARQL <http://www.w3.org/TR/rdf-sparql-query/>`_ query language.
-
-    .. versionadded:: 2.0
-    """
-    name = 'SPARQL'
-    aliases = ['sparql']
-    filenames = ['*.rq', '*.sparql']
-    mimetypes = ['application/sparql-query']
-
-    # character group definitions ::
-
-    PN_CHARS_BASE_GRP = (u'a-zA-Z'
-                         u'\u00c0-\u00d6'
-                         u'\u00d8-\u00f6'
-                         u'\u00f8-\u02ff'
-                         u'\u0370-\u037d'
-                         u'\u037f-\u1fff'
-                         u'\u200c-\u200d'
-                         u'\u2070-\u218f'
-                         u'\u2c00-\u2fef'
-                         u'\u3001-\ud7ff'
-                         u'\uf900-\ufdcf'
-                         u'\ufdf0-\ufffd')
-
-    PN_CHARS_U_GRP = (PN_CHARS_BASE_GRP + '_')
-
-    PN_CHARS_GRP = (PN_CHARS_U_GRP +
-                    r'\-' +
-                    r'0-9' +
-                    u'\u00b7' +
-                    u'\u0300-\u036f' +
-                    u'\u203f-\u2040')
-
-    HEX_GRP = '0-9A-Fa-f'
-
-    PN_LOCAL_ESC_CHARS_GRP = r' _~.\-!$&"()*+,;=/?#@%'
-
-    # terminal productions ::
-
-    PN_CHARS_BASE = '[' + PN_CHARS_BASE_GRP + ']'
-
-    PN_CHARS_U = '[' + PN_CHARS_U_GRP + ']'
-
-    PN_CHARS = '[' + PN_CHARS_GRP + ']'
-
-    HEX = '[' + HEX_GRP + ']'
-
-    PN_LOCAL_ESC_CHARS = '[' + PN_LOCAL_ESC_CHARS_GRP + ']'
-
-    IRIREF = r'<(?:[^<>"{}|^`\\\x00-\x20])*>'
-
-    BLANK_NODE_LABEL = '_:[0-9' + PN_CHARS_U_GRP + '](?:[' + PN_CHARS_GRP + \
-                       '.]*' + PN_CHARS + ')?'
-
-    PN_PREFIX = PN_CHARS_BASE + '(?:[' + PN_CHARS_GRP + '.]*' + PN_CHARS + ')?'
-
-    VARNAME = u'[0-9' + PN_CHARS_U_GRP + '][' + PN_CHARS_U_GRP + \
-              u'0-9\u00b7\u0300-\u036f\u203f-\u2040]*'
-
-    PERCENT = '%' + HEX + HEX
-
-    PN_LOCAL_ESC = r'\\' + PN_LOCAL_ESC_CHARS
-
-    PLX = '(?:' + PERCENT + ')|(?:' + PN_LOCAL_ESC + ')'
-
-    PN_LOCAL = ('(?:[' + PN_CHARS_U_GRP + ':0-9' + ']|' + PLX + ')' +
-                '(?:(?:[' + PN_CHARS_GRP + '.:]|' + PLX + ')*(?:[' +
-                PN_CHARS_GRP + ':]|' + PLX + '))?')
-
-    EXPONENT = r'[eE][+-]?\d+'
-
-    # Lexer token definitions ::
-
-    tokens = {
-        'root': [
-            (r'\s+', Text),
-            # keywords ::
-            (r'(?i)(select|construct|describe|ask|where|filter|group\s+by|minus|'
-             r'distinct|reduced|from\s+named|from|order\s+by|desc|asc|limit|'
-             r'offset|bindings|load|clear|drop|create|add|move|copy|'
-             r'insert\s+data|delete\s+data|delete\s+where|delete|insert|'
-             r'using\s+named|using|graph|default|named|all|optional|service|'
-             r'silent|bind|union|not\s+in|in|as|having|to|prefix|base)\b', Keyword),
-            (r'(a)\b', Keyword),
-            # IRIs ::
-            ('(' + IRIREF + ')', Name.Label),
-            # blank nodes ::
-            ('(' + BLANK_NODE_LABEL + ')', Name.Label),
-            #  # variables ::
-            ('[?$]' + VARNAME, Name.Variable),
-            # prefixed names ::
-            (r'(' + PN_PREFIX + r')?(\:)(' + PN_LOCAL + r')?',
-             bygroups(Name.Namespace, Punctuation, Name.Tag)),
-            # function names ::
-            (r'(?i)(str|lang|langmatches|datatype|bound|iri|uri|bnode|rand|abs|'
-             r'ceil|floor|round|concat|strlen|ucase|lcase|encode_for_uri|'
-             r'contains|strstarts|strends|strbefore|strafter|year|month|day|'
-             r'hours|minutes|seconds|timezone|tz|now|md5|sha1|sha256|sha384|'
-             r'sha512|coalesce|if|strlang|strdt|sameterm|isiri|isuri|isblank|'
-             r'isliteral|isnumeric|regex|substr|replace|exists|not\s+exists|'
-             r'count|sum|min|max|avg|sample|group_concat|separator)\b',
-             Name.Function),
-            # boolean literals ::
-            (r'(true|false)', Keyword.Constant),
-            # double literals ::
-            (r'[+\-]?(\d+\.\d*' + EXPONENT + r'|\.?\d+' + EXPONENT + ')', Number.Float),
-            # decimal literals ::
-            (r'[+\-]?(\d+\.\d*|\.\d+)', Number.Float),
-            # integer literals ::
-            (r'[+\-]?\d+', Number.Integer),
-            # operators ::
-            (r'(\|\||&&|=|\*|\-|\+|/|!=|<=|>=|!|<|>)', Operator),
-            # punctuation characters ::
-            (r'[(){}.;,:^\[\]]', Punctuation),
-            # line comments ::
-            (r'#[^\n]*', Comment),
-            # strings ::
-            (r'"""', String, 'triple-double-quoted-string'),
-            (r'"', String, 'single-double-quoted-string'),
-            (r"'''", String, 'triple-single-quoted-string'),
-            (r"'", String, 'single-single-quoted-string'),
-        ],
-        'triple-double-quoted-string': [
-            (r'"""', String, 'end-of-string'),
-            (r'[^\\]+', String),
-            (r'\\', String, 'string-escape'),
-        ],
-        'single-double-quoted-string': [
-            (r'"', String, 'end-of-string'),
-            (r'[^"\\\n]+', String),
-            (r'\\', String, 'string-escape'),
-        ],
-        'triple-single-quoted-string': [
-            (r"'''", String, 'end-of-string'),
-            (r'[^\\]+', String),
-            (r'\\', String.Escape, 'string-escape'),
-        ],
-        'single-single-quoted-string': [
-            (r"'", String, 'end-of-string'),
-            (r"[^'\\\n]+", String),
-            (r'\\', String, 'string-escape'),
-        ],
-        'string-escape': [
-            (r'u' + HEX + '{4}', String.Escape, '#pop'),
-            (r'U' + HEX + '{8}', String.Escape, '#pop'),
-            (r'.', String.Escape, '#pop'),
-        ],
-        'end-of-string': [
-            (r'(@)([a-zA-Z]+(?:-[a-zA-Z0-9]+)*)',
-             bygroups(Operator, Name.Function), '#pop:2'),
-            (r'\^\^', Operator, '#pop:2'),
-            default('#pop:2'),
-        ],
-    }
-
-
-class TurtleLexer(RegexLexer):
-    """
-    Lexer for `Turtle <http://www.w3.org/TR/turtle/>`_ data language.
-
-    .. versionadded:: 2.1
-    """
-    name = 'Turtle'
-    aliases = ['turtle']
-    filenames = ['*.ttl']
-    mimetypes = ['text/turtle', 'application/x-turtle']
-
-    flags = re.IGNORECASE
-
-    patterns = {
-        'PNAME_NS': r'((?:[a-z][\w-]*)?\:)',  # Simplified character range
-        'IRIREF': r'(<[^<>"{}|^`\\\x00-\x20]*>)'
-    }
-
-    # PNAME_NS PN_LOCAL (with simplified character range)
-    patterns['PrefixedName'] = r'%(PNAME_NS)s([a-z][\w-]*)' % patterns
-
-    tokens = {
-        'root': [
-            (r'\s+', Whitespace),
-
-            # Base / prefix
-            (r'(@base|BASE)(\s+)%(IRIREF)s(\s*)(\.?)' % patterns,
-             bygroups(Keyword, Whitespace, Name.Variable, Whitespace,
-                      Punctuation)),
-            (r'(@prefix|PREFIX)(\s+)%(PNAME_NS)s(\s+)%(IRIREF)s(\s*)(\.?)' % patterns,
-             bygroups(Keyword, Whitespace, Name.Namespace, Whitespace,
-                      Name.Variable, Whitespace, Punctuation)),
-
-            # The shorthand predicate 'a'
-            (r'(?<=\s)a(?=\s)', Keyword.Type),
-
-            # IRIREF
-            (r'%(IRIREF)s' % patterns, Name.Variable),
-
-            # PrefixedName
-            (r'%(PrefixedName)s' % patterns,
-             bygroups(Name.Namespace, Name.Tag)),
-
-            # Comment
-            (r'#[^\n]+', Comment),
-
-            (r'\b(true|false)\b', Literal),
-            (r'[+\-]?\d*\.\d+', Number.Float),
-            (r'[+\-]?\d*(:?\.\d+)?E[+\-]?\d+', Number.Float),
-            (r'[+\-]?\d+', Number.Integer),
-            (r'[\[\](){}.;,:^]', Punctuation),
-
-            (r'"""', String, 'triple-double-quoted-string'),
-            (r'"', String, 'single-double-quoted-string'),
-            (r"'''", String, 'triple-single-quoted-string'),
-            (r"'", String, 'single-single-quoted-string'),
-        ],
-        'triple-double-quoted-string': [
-            (r'"""', String, 'end-of-string'),
-            (r'[^\\]+', String),
-            (r'\\', String, 'string-escape'),
-        ],
-        'single-double-quoted-string': [
-            (r'"', String, 'end-of-string'),
-            (r'[^"\\\n]+', String),
-            (r'\\', String, 'string-escape'),
-        ],
-        'triple-single-quoted-string': [
-            (r"'''", String, 'end-of-string'),
-            (r'[^\\]+', String),
-            (r'\\', String, 'string-escape'),
-        ],
-        'single-single-quoted-string': [
-            (r"'", String, 'end-of-string'),
-            (r"[^'\\\n]+", String),
-            (r'\\', String, 'string-escape'),
-        ],
-        'string-escape': [
-            (r'.', String, '#pop'),
-        ],
-        'end-of-string': [
-            (r'(@)([a-z]+(:?-[a-z0-9]+)*)',
-             bygroups(Operator, Generic.Emph), '#pop:2'),
-
-            (r'(\^\^)%(IRIREF)s' % patterns, bygroups(Operator, Generic.Emph), '#pop:2'),
-            (r'(\^\^)%(PrefixedName)s' % patterns,
-             bygroups(Operator, Generic.Emph, Generic.Emph), '#pop:2'),
-
-            default('#pop:2'),
-
-        ],
-    }
-
-    # Turtle and Tera Term macro files share the same file extension
-    # but each has a recognizable and distinct syntax.
-    def analyse_text(text):
-        for t in ('@base ', 'BASE ', '@prefix ', 'PREFIX '):
-            if re.search(r'^\s*%s' % t, text):
-                return 0.80
-
-
-class ShExCLexer(RegexLexer):
-    """
-    Lexer for `ShExC <https://shex.io/shex-semantics/#shexc>`_ shape expressions language syntax.
-    """
-    name = 'ShExC'
-    aliases = ['shexc', 'shex']
-    filenames = ['*.shex']
-    mimetypes = ['text/shex']
-
-    # character group definitions ::
-
-    PN_CHARS_BASE_GRP = (u'a-zA-Z'
-                         u'\u00c0-\u00d6'
-                         u'\u00d8-\u00f6'
-                         u'\u00f8-\u02ff'
-                         u'\u0370-\u037d'
-                         u'\u037f-\u1fff'
-                         u'\u200c-\u200d'
-                         u'\u2070-\u218f'
-                         u'\u2c00-\u2fef'
-                         u'\u3001-\ud7ff'
-                         u'\uf900-\ufdcf'
-                         u'\ufdf0-\ufffd')
-
-    PN_CHARS_U_GRP = (PN_CHARS_BASE_GRP + '_')
-
-    PN_CHARS_GRP = (PN_CHARS_U_GRP +
-                    r'\-' +
-                    r'0-9' +
-                    u'\u00b7' +
-                    u'\u0300-\u036f' +
-                    u'\u203f-\u2040')
-
-    HEX_GRP = '0-9A-Fa-f'
-
-    PN_LOCAL_ESC_CHARS_GRP = r"_~.\-!$&'()*+,;=/?#@%"
-
-    # terminal productions ::
-
-    PN_CHARS_BASE = '[' + PN_CHARS_BASE_GRP + ']'
-
-    PN_CHARS_U = '[' + PN_CHARS_U_GRP + ']'
-
-    PN_CHARS = '[' + PN_CHARS_GRP + ']'
-
-    HEX = '[' + HEX_GRP + ']'
-
-    PN_LOCAL_ESC_CHARS = '[' + PN_LOCAL_ESC_CHARS_GRP + ']'
-
-    UCHAR_NO_BACKSLASH = '(?:u' + HEX + '{4}|U' + HEX + '{8})'
-
-    UCHAR = r'\\' + UCHAR_NO_BACKSLASH
-
-    IRIREF = r'<(?:[^\x00-\x20<>"{}|^`\\]|' + UCHAR + ')*>'
-
-    BLANK_NODE_LABEL = '_:[0-9' + PN_CHARS_U_GRP + '](?:[' + PN_CHARS_GRP + \
-                       '.]*' + PN_CHARS + ')?'
-
-    PN_PREFIX = PN_CHARS_BASE + '(?:[' + PN_CHARS_GRP + '.]*' + PN_CHARS + ')?'
-
-    PERCENT = '%' + HEX + HEX
-
-    PN_LOCAL_ESC = r'\\' + PN_LOCAL_ESC_CHARS
-
-    PLX = '(?:' + PERCENT + ')|(?:' + PN_LOCAL_ESC + ')'
-
-    PN_LOCAL = ('(?:[' + PN_CHARS_U_GRP + ':0-9' + ']|' + PLX + ')' +
-                '(?:(?:[' + PN_CHARS_GRP + '.:]|' + PLX + ')*(?:[' +
-                PN_CHARS_GRP + ':]|' + PLX + '))?')
-
-    EXPONENT = r'[eE][+-]?\d+'
-
-    # Lexer token definitions ::
-
-    tokens = {
-        'root': [
-            (r'\s+', Text),
-            # keywords ::
-            (r'(?i)(base|prefix|start|external|'
-             r'literal|iri|bnode|nonliteral|length|minlength|maxlength|'
-             r'mininclusive|minexclusive|maxinclusive|maxexclusive|'
-             r'totaldigits|fractiondigits|'
-             r'closed|extra)\b', Keyword),
-            (r'(a)\b', Keyword),
-            # IRIs ::
-            ('(' + IRIREF + ')', Name.Label),
-            # blank nodes ::
-            ('(' + BLANK_NODE_LABEL + ')', Name.Label),
-            # prefixed names ::
-            (r'(' + PN_PREFIX + r')?(\:)(' + PN_LOCAL + ')?',
-             bygroups(Name.Namespace, Punctuation, Name.Tag)),
-            # boolean literals ::
-            (r'(true|false)', Keyword.Constant),
-            # double literals ::
-            (r'[+\-]?(\d+\.\d*' + EXPONENT + r'|\.?\d+' + EXPONENT + ')', Number.Float),
-            # decimal literals ::
-            (r'[+\-]?(\d+\.\d*|\.\d+)', Number.Float),
-            # integer literals ::
-            (r'[+\-]?\d+', Number.Integer),
-            # operators ::
-            (r'[@|$&=*+?^\-~]', Operator),
-            # operator keywords ::
-            (r'(?i)(and|or|not)\b', Operator.Word),
-            # punctuation characters ::
-            (r'[(){}.;,:^\[\]]', Punctuation),
-            # line comments ::
-            (r'#[^\n]*', Comment),
-            # strings ::
-            (r'"""', String, 'triple-double-quoted-string'),
-            (r'"', String, 'single-double-quoted-string'),
-            (r"'''", String, 'triple-single-quoted-string'),
-            (r"'", String, 'single-single-quoted-string'),
-        ],
-        'triple-double-quoted-string': [
-            (r'"""', String, 'end-of-string'),
-            (r'[^\\]+', String),
-            (r'\\', String, 'string-escape'),
-        ],
-        'single-double-quoted-string': [
-            (r'"', String, 'end-of-string'),
-            (r'[^"\\\n]+', String),
-            (r'\\', String, 'string-escape'),
-        ],
-        'triple-single-quoted-string': [
-            (r"'''", String, 'end-of-string'),
-            (r'[^\\]+', String),
-            (r'\\', String.Escape, 'string-escape'),
-        ],
-        'single-single-quoted-string': [
-            (r"'", String, 'end-of-string'),
-            (r"[^'\\\n]+", String),
-            (r'\\', String, 'string-escape'),
-        ],
-        'string-escape': [
-            (UCHAR_NO_BACKSLASH, String.Escape, '#pop'),
-            (r'.', String.Escape, '#pop'),
-        ],
-        'end-of-string': [
-            (r'(@)([a-zA-Z]+(?:-[a-zA-Z0-9]+)*)',
-             bygroups(Operator, Name.Function), '#pop:2'),
-            (r'\^\^', Operator, '#pop:2'),
-            default('#pop:2'),
-        ],
-    }