    # SPARQL Query for Syntax Highlighting Test
    # This query includes a wide range of features to test a highlighter's capabilities.

    # == 1. Prologue: Base URI and Prefixes
    BASE          <http://example.org/book-data/>
    PREFIX ex:    <http://example.org/vocab#>
    PREFIX foaf:  <http://xmlns.com/foaf/0.1/>
    PREFIX rdf:   <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
    PREFIX rdfs:  <http://www.w3.org/2000/01/rdf-schema#>
    PREFIX xsd:   <http://www.w3.org/2001/XMLSchema#>
    PREFIX dc:    <http://purl.org/dc/elements/1.1/>

    # == 2. Query Form: SELECT with Expressions and Aggregates
    SELECT DISTINCT
        ?authorName
        (UCASE(?title) AS ?upperCaseTitle)
        ?publicationDate
        # Aggregate functions
        (COUNT(?character) AS ?characterCount)
        (GROUP_CONCAT(DISTINCT ?genre; SEPARATOR=", ") AS ?genres)
        (AVG(?rating) AS ?averageRating)

    # == 3. Dataset Clause: Defining the Query Target
    FROM <http://example.org/library-main-graph>
    FROM NAMED <http://example.org/library-metadata-graph>

    # == 4. Query Pattern: The Core Logic
    WHERE {
        # Inline data with VALUES
        VALUES ?authorType { foaf:Person ex:FictionalEntity }

        # Basic Graph Pattern with various term types
        ?author a foaf:person ;
                rdf:type ?authorType ;
                foaf:name ?authorName ;
                foaf:birthday ?birthDate . # Semicolon for predicate-object lists

        ?author foaf:smoker true .
        ?author foaf:child false .

        # Property path: one or more 'knows' relationships
        ?author foaf:knows+ ?colleague .

        # Nested blank node syntax
        ?book dc:creator [ foaf:name ?authorName ] ;
              dc:title ?title ;
              ex:rating ?rating . # Period to end the triple block.

        # OPTIONAL block for data that may not exist
        OPTIONAL {
            ?book ex:hasCharacter ?character .
            ?character foaf:name ?characterName .
        }

        # UNION to combine results from alternative patterns
        {
            ?book ex:genre "Science Fiction"@en .
        }
        UNION
        {
            ?book ex:genre "Fantasy"^^xsd:string .
        }

        # BIND to compute and assign a new variable
        BIND(YEAR(?birthDate) AS ?birthYear)

        # Subquery to pre-filter books
        {
          SELECT ?book ?publicationDate WHERE {
            ?book dc:date ?publicationDate .
            FILTER(?publicationDate > "2000-01-01T00:00:00"^^xsd:dateTime && ?publicationDate < "2010-01-01T00:00:00"^^xsd:dateTime)
          }
          LIMIT 100
        }

        # GRAPH clause to query a specific named graph
        GRAPH <http://example.org/library-metadata-graph> {
            ?book ex:reviewedBy _:reviewer . # Blank node label
        }

        # SERVICE clause for federated queries
        SERVICE <http://dbpedia.org/sparql> {
            ?colleague rdfs:label ?colleagueLabel .
            FILTER(LANG(?colleagueLabel) = "en")
        }

        # FILTER clause with a variety of functions and operators
        FILTER (
            # Logical, comparison, and arithmetic
            (?rating > 3.5 && ?birthYear < 1980) ||
            # Regular expression
            REGEX(?authorName, "^J\\.\\s?K\\.", "i") &&
            # Check for existence of a value
            BOUND(?characterName) &&
            # String and numeric functions
            (STRLEN(?title) - 5 > 10) &&
            # IN operator
            ?genre IN ("Fantasy", "Sci-Fi") &&
            # Datatype and language checks
            LANGMATCHES(LANG(?title), "en-US") &&
            DATATYPE(?rating) = xsd:decimal
        )

        FILTER NOT EXISTS {
            ?colleague schema:memberOf ?organization .
        }
    }

    # == 5. Solution Modifiers: Ordering, Grouping, and Slicing
    GROUP BY ?authorName ?title ?publicationDate
    HAVING (COUNT(?character) >= 2) # Filter on aggregate results
    ORDER BY DESC(?averageRating) ASC(?authorName)
    LIMIT 10
    OFFSET 20

    # == Other SPARQL Keywords (for syntax highlighting completeness)
    # CONSTRUCT, DESCRIBE, ASK (alternative query forms)
    # INSERT DATA, DELETE DATA, LOAD, CLEAR, CREATE, DROP (update operations)