Validation functions

Introduction

These functions are typically used on the constraint attribute of the xf:bind element. For example, as used by Form Builder:

<xf:bind
    id="control-1-bind"
    name="control-1"
    ref="control-1"
    type="xf:decimal"
    constraint="xxf:fraction-digits(2)"/>

All these functions annotate the context instance data node (element or attribute) with:

• a custom MIP of the same name

• with a value set to the single parameter to the function

xxf:upload-max-size()

[SINCE Orbeon Forms 2017.1]

xxf:upload-max-size($bytes as xs:integer?) as xs:boolean

• $bytes

  • non-negative value: limited upload file size

  • -1: unlimited upload file size

  • -2 or lower: ignored for the purpose of checking the upload file size

• always return true(), as the validation is only used at the time of upload

xxf:upload-mediatypes()

[SINCE Orbeon Forms 2017.1]

xxf:upload-mediatypes($mediatypes as xs:string?) as xs:boolean

• $mediatypes

  • the value is a list of space- or comma-separated mediatype ranges

  • a mediatype range is one of:

    • */*: all mediatypes allowed

    • type/*: all mediatypes with prefix type are allowed (for example image/*)

    • type/subtype: specific mediatype such as image/jpeg, application/atom+xml, video/mp4, etc.

• always return true(), as the validation is only used at the time of upload

xxf:fraction-digits()

[SINCE Orbeon Forms 2016.1]

xxf:fraction-digits($digits as xs:integer?) as xs:boolean

Return true() if the context item converted to a string via the string() function contains at most the number of consecutive digits specified by $digits after the decimal point ., or if there is no decimal point. Also return true() if $digits is the empty sequence.

Note the following:

• Trailing 0s are not counted.

• Characters other than digits are ignored.

For example, if the context item is the string "abc123.d450f0g", the resulting consecutive digits after the decimal point considered are "45" and the number of consecutive digits after the decimal point is 2.

xxf:max-length()

[SINCE Orbeon Forms 4.10]

xxf:max-length($max as xs:integer?) as xs:boolean

Return true() if the context item converted to a string via the string() function contains at most the number of characters specified by $max. Also return true() if $max is the empty sequence.

Following XPath 2.0:

what is counted is the number of XML characters in the string (or equivalently, the number of Unicode code points). Some implementations may represent a code point above xFFFF using two 16-bit values known as a surrogate. A surrogate counts as one character, not two.

xxf:min-length()

[SINCE Orbeon Forms 4.10]

xxf:min-length($min as xs:integer?) as xs:boolean

Return true() if the context item converted to a string via the string() function contains at least the number of characters specified by $min. Also return true() if $min is the empty sequence.

Following XPath 2.0:

what is counted is the number of XML characters in the string (or equivalently, the number of Unicode code points). Some implementations may represent a code point above xFFFF using two 16-bit values known as a surrogate. A surrogate counts as one character, not two.

xxf:negative()

[SINCE Orbeon Forms 2016.1]

xxf:negative() as xs:boolean

• return true() if the context item converted to a string via the string() function parses as an xs:decimal which is negative

• return false() otherwise

xxf:non-negative()

[SINCE Orbeon Forms 2016.1]

xxf:non-negative() as xs:boolean

• return true() if the context item converted to a string via the string() function parses as an xs:decimal which is not negative

• return false() otherwise

xxf:non-positive()

[SINCE Orbeon Forms 2016.1]

xxf:non-positive() as xs:boolean

• return true() if the context item converted to a string via the string() function parses as an xs:decimal which is not positive

• return false() otherwise

xxf:positive()

[SINCE Orbeon Forms 2016.1]

xxf:positive() as xs:boolean

• return true() if the context item converted to a string via the string() function parses as an xs:decimal which is positive

• return false() otherwise