XML Services supports the following XPath syntax; the extensions are in bold. Adaptive Server version 12.5.2 extends the syntax for primary_expr and adds syntax for function_call.
xpath::= or_expr or_expr::= and_expr | and_expr TOKEN_OR or_expr and_expr::= union_expr | union_expr TOKEN_AND and_expr union_expr::= intersect_expr | intersect_expr TOKEN_UNION union_expr intersect_expr::= comparison_expr | comparison_expr TOKEN_INTERSECT intersect_expr comparison_expr::= range_exp | range_expr general_comp comparisonRightHandSide general_comp::= TOKEN_EQUAL | TOKEN_NOTEQUAL | TOKEN_LESSTHAN | TOKEN_LESSTHANEQUAL | TOKEN_GREATERTHAN | TOKEN_GREATERTHANEQUAL range_expr::= unary_expr | unary_expr TOKEN_TO unary_expr unary_expr::= TOKEN_MINUS path_expr | TOKEN_PLUS path_expr | path_expr comparisonRightHandSide::= literal path_expr::= relativepath_expr | TOKEN_SLASH | TOKEN_SLASH relativepath_expr
| TOKEN_DOUBLESLASH relativepath_expr relativepath_expr::= step_expr | step_expr TOKEN_SLASH relativepath_expr | step_expr TOKEN_DOUBLESLASH relativepath_expr step_expr::= forward_step predicates | primary_expr predicates | predicates primary_expr::= literal | function_call | (xpath) function_call::= tolower([xpath]) | toupper([xpath]) | normalize-space([xpath]) | concat([xpath [,xpath]...]) forward_step::= abbreviated_forward_step abbreviated_forward_step::= name_test | TOKEN_ATRATE name_test | TOKEN_PERIOD name_test::= q_name | wild_card | text test text_test ::= TOKEN_TEXT TOKEN_LPAREN TOKEN_RPAREN literal::= numeric_literal | string_literal wild_card::= TOKEN_ASTERISK q_name::= TOKEN_ID string_literal::= TOKEN_STRING numeric_literal::= TOKEN_INT | TOKEN_FLOATVAL| | TOKEN_MINUS TOKEN_INT | TOKEN_MINUSTOKEN_FLOATVAL predicates::= | TOKEN_LSQUARE expr TOKEN_RSQUARE predicates | TOKEN_LSQUARE expr TOKEN_RSQUARE
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