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Function name | Description |
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fn.avg | Returns the average of the values in the input sequence $arg, that is, the sum of the values divided by the number of values. |

fn.boolean | Computes the effective boolean value of the sequence $arg. |

fn.collection | Returns all of the documents that belong to the specified collection(s). |

fn.count | Returns the number of items in the value of $arg. |

fn.deepEqual | This function assesses whether two sequences are deep-equal to each other. |

fn.distinctValues | Returns the sequence that results from removing from $arg all but one of a set of values that are eq to one other. |

fn.doc | Returns the document(s) stored in the database at the specified URI(s). |

fn.docAvailable | If fn:doc($uri) returns a document node, this function returns true. |

fn.empty | If the value of $arg is the empty sequence, the function returns true; otherwise, the function returns false. |

fn.exactlyOne | Returns $arg if it contains exactly one item. |

fn.exists | If the value of $arg is not the empty sequence, the function returns true; otherwise, the function returns false. |

fn.head | Returns the first item in a sequence. |

fn.id | Returns the sequence of element nodes that have an ID value matching the value of one or more of the IDREF values supplied in $arg. |

fn.idref | Returns the sequence of element or attribute nodes that have an IDREF value matching the value of one or more of the ID values supplied in $arg. |

fn.indexOf | Returns a sequence of positive integers giving the positions within the sequence $seqParam of items that are equal to $srchParam. |

fn.insertBefore | Returns a new sequence constructed from the value of $target with the value of $inserts inserted at the position specified by the value of $position. |

fn.max | Selects an item from the input sequence $arg whose value is greater than or equal to the value of every other item in the input sequence. |

fn.min | Selects an item from the input sequence $arg whose value is less than or equal to the value of every other item in the input sequence. |

fn.oneOrMore | Returns $arg if it contains one or more items. |

fn.remove | Returns a new sequence constructed from the value of $target with the item at the position specified by the value of $position removed. |

fn.reverse | Reverses the order of items in a sequence. |

fn.subsequence | Returns the contiguous sequence of items in the value of $sourceSeq beginning at the position indicated by the value of $startingLoc and continuing for the number of items indicated by the value of $length. |

fn.sum | Returns a value obtained by adding together the values in $arg. |

fn.tail | Returns all but the first item in a sequence. |

fn.unordered | Returns the items of $sourceSeq in an implementation dependent order. |

fn.zeroOrOne | Returns $arg if it contains zero or one items. |