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

fn:distinct-nodes | [0.9-ml only] Returns the sequence resulting from removing from the input sequence all but one of a set of nodes that have the same identity as one another. |

fn:distinct-values | 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:doc-available | 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:exactly-one | 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:index-of | Returns a sequence of positive integers giving the positions within the sequence $seqParam of items that are equal to $srchParam. |

fn:insert-before | 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:one-or-more | 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:zero-or-one | Returns $arg if it contains zero or one items. |