Root element of the course. Version of the education markup language that this course is written in. Must match the language version of this schema. Contains all global course settings. Sets the default variant of the course by specifying its language. Contains one or more style assignments to elements with specified roles. ]]> Assigns a list of CSS style declarations to all elements with a specified role. font-weight: bold; ]]> The role which an element must have in order for this style setting to apply. Zero or more CSS style declarations, each one terminated by a semicolon. Defines the settings for input elements in this course. A group of settings for input elements that can be enabled by using the model attribute on input elements. If the name attribute is not set, this input model describes the default input model. Name of this input model. If this is not set, this input model describes the default input model. A format for the automatic generation of labels. No labels. 1,2,3,4,5... i,ii,iii,iv,v... I,II,III,IV,V... a,b,c,d,e,... A,B,C,D,E,... α,β,γ,δ,ε,... Use bullet points as labels. Use dots as labels. Use dashed as labels. A variant of the course for a specified language. Language of this course variant according to RFC 5646, must be unique among all course variants in this course. Title of either a course variant, a page, a container or a panel. Alternative short version of the title that can be used in situations where the full title can not be displayed. Contains all information about the navigation menu of a course variant. Whether or not the automatically generated labels of a navigation item should include the full numbering of all of its parent navigation items or only its number in the list of the children of its parent. A list of one or more navigation items in the navigation menu. Format used for the automatically generated label of the navigation items in this list. Separator used in the automatically generated label of the navigation items in this list. Controls whether the last separator should be shown in the automatically generated label of the navigation items in this list. The horizontal length (in CSS units) by which sub items should be indented. If this attribute is not set, the application will indent by a default length, which is guaranteed to be strictly smaller than 0. One item in the navigation menu of the course variant. Name of this navigation item, must be unique among all names in this course variant. A space-separated list of tags for this navigation item. Gives this navigation items special roles. Must be a space-separated list of the roles "learnpath", "home", "impressum" and "privacy". Controls whether or not this navigation item should be visible for the user. Controls whether or not this navigation item increases the counter for the automatically generated labels. Custom label of this navigation item, overrides any automatically generated labels. A space-separated list of navigation item roles. A special role that a navigation item may have. Marks the navigation item as learn path. Marks the navigation item as starting page. Marks the navigation item as impressum. Marks the navigation item as privacy site. Contains all pages of a course variant. One page in the course, consists of an optional title and a sequence of containers. Name of this page, must be unique among all names in this course variant. A space-separated list of tags for this page. Defines a parameter whose value will be randomly chosen each time the page is reloaded. The parameter can be used in all calculate elements and input elements inside the container in which it is defined. Each time the page is reloaded, one of the value generators defined as child elements of this element is randomly chosen and called to generate a new parameter value. Parameters can be defined at the start of each box and are only accessible inside the box in which they are defined. The following parameter can take the values 1, 2, 3, 4, 5 and 20: 1 5 20 ]]> Defines the identifier by which this parameter can be referred to in all calculate and input elements inside the surrounding box. Must be unique among all parameters defined in the surrounding box. Defines the weight of this parameter value generator among all value generators specified for the parameter. Generates a single value for a parameter that can be a string or a number. Generates a single value for a parameter that must be a number. Uniformly generates a random value from a specified range for a parameter. The start and end values for the range must be defined in the child elements. In contrast to the values appearing direct in the parameter element, these two values must be numbers. If this optional attribute is set, the range consists only of the numbers that are inside the interval defined by the start and end values and by the closure attribute and whose absolute difference from the start value is a multiple of the step value. Otherwise, the range is continuous. The type of the interval which this range should be based on. This decides whether or not the start and end values should be part of the range or not. Whether or not the specified number should be part of the parameter value range or not. Defines the start of a parameter value range. Defines the end of a parameter value range. An optional subtype that further describes the content type of this box. For example, a theorembox can have the subtype "lemma". Number that specifies the difficulty of this content. A lower value means a lower difficulty, a higher value means a higher difficulty. If this attribute is not set, the difficulty is considered to be 0. A path to a preview image that should be displayed as long as the content itself is not loaded. Whether or not the content should be loaded automatically without a user interaction. If this attribute is not set, the application will apply a suitable default behavior. A view that wraps a sequence of containers and has an optional title. A view that wraps a sequence of containers and has a mandatory title. A view that wraps a sequence of containers and shows only a selection of them that is randomly chosen each time the page is reloaded. Amount of group views that are shown. A view that wraps a sequence of containers that are optional in the sense that the course can be followed without them. A view that wraps a sequence of group views (with mandatory titles) and displays them in an accordion. This element should not be used to hold solutions. For this task, use the solutionhint element. A view that wraps a sequence of group views (with mandatory titles) and displays them as items in a tab set. This element should not be used to hold solutions. For this task, use the solutionhint element. A view that warps a sequence of group views (with optional titles) and displays them in a carousel. Only one of the group views is visible at once and the user can go to the next or previous one on demand. Whether or not the sequence of group views should be wrapped to a loop for the user, starting with the first one again after the last one. When this attribute is set, the carousel view will automatically go to the next group view after the given number of seconds. Whether or not the height of the carousel should be fixed to the maximum of the height of its childrens. If this attribute is set to false, the height of the carousel changes dynamically depending on the active child. A container with block content. A container with block content tagged as information. A container with block content tagged as a hint. A container with block content tagged as help. A container with block content tagged as remark. A container with block content tagged as example. A container with block content tagged as theorem. A container with block content tagged as a proof. A container with block content tagged as a definition. A container with block content tagged as an experiment. A container with block content tagged as exercise. A box whose content is a convention. A convention is a determination that is valid for the whole course or a part of the course. A box whose main purpose is to present a formula to the user. A box for content that describes an application of other content. Name of this container, must be unique among all names in this course variant. A space-separated list of tags for this container. Custom label for this container, overriding any automatically generated label. Name of this content element, must be unique among all names in this course variant. A space-separated list of tags for this content element. Inline element which indicates that its content has strong importance. Inline element which indicates that its content has stress emphasis. Inline element which underlines its content. Inline element which places a horizontal line through its content. Inline element which places its content in superscript. Inline element which places its content in subscript. Inline element which indicates that its content is a hint. Inline element which indicates that its content is an information. Inline element which indicates that its content is a help for the reader. Inline element which indicates that its content is a warning for the reader. An inline quotation that will be surrounded by quotation marks according to the course variant language. Block element that shows one or more panels as tabs. This element should not be used to hold solutions. For this task, use the solutionhint element. An external media object embedded from a web page. Path to the external web page. An URL that must start with "http://" or "https://". Block element for an accordion with one or more panels. This element should not be used to hold solutions. For this task, use the solutionhint element. A constituent of either an accordion (block element) or a tabset (also a block element). Shows a figure (for example an image, a video, or a table) with an optional caption. Caption of a figure block. Horizontal alignment of a block element. Aligned to the left side of its parent. Aligned to the right side of its parent Aligned to the center of its parent Inline element for a code fragment with optional syntax highlighting. In Java, classes are defined using the class keyword.

]]> Math formula with LaTeX content. Will be displayed with MathJax. Determines whether this formula should be displayed as an inline element or block element. Horizontal alignment of this formula when displayed as a block element. Describes the visual style of a math formula in the output. Display the math formula as an inline element. Display the math formula as a centered block element. Block element displaying a quotation. Block element for a code listing with optional syntax hightlighting. Block element in which the user can write source code in a specified programming language and execute it. Short string identifying the programming language to be used, such as "java". Whether the user should write multiple source code files, only one file or several functions or statements. The type of a code environment element. One or multiple source code files. A single source code file. One or multiple functions. One or multiple statements. Initial code content of a codeenvironment element. Short string identifying the language of the code content, such as "java", "c++" or "xml". A line break. Should not be used to distinguish paragraphs. Contains information about the metadata of a resource that is used in the course, such as a picture or a video. Note that every metadata element should contain at least one license child element, even through this is currently not validated by the schema. An URL to a resource that contains further information about this metadata field. An entity who is primarily responsible for making a resource. A point of time associated with an event in the lifecycle of a resource. A description or an account of a resource. A description of a related resource from which the described resource is derived. Describes the license of a resource. Minimum width of this media object as CSS length. If this attribute is not set, the processing application will apply a suitable default value. Maximal width of this media object as CSS length. If this attribute is not set, the processing application will apply a suitable default value. Minimum height of this media object as CSS length. If this attribute is not set, the processing application will apply a suitable default value. Maximal height of this media object as CSS length. If this attribute is not set, the processing application will apply a suitable default value. Displays a picture loaded from a local image file. The image file can contain either a raster graphic graphic (for example, a PNG file) or a vector graphic (for example, an SVG file). Path to the image file relative to the current document. Plays a video loaded from a local video file (for example, an MP4 file). Path to the video file relative to the current document. A reference to another part of the course. Name of the target element to which this reference points. Link to an external resource, such as a website or an email address. URI of the external resource to which this link points. Inline element that can be used to give its content a name and/or to assign semantic roles to its content. Vektorraum ist eine Menge ...]]> A space-separated list of semantic roles that should be applied to the content of this element. Block element that will be displayed as a flexbox. An item of a flexbox. The direction flex items are placed in the flex container. Defines whether the flex items are forced in a single line or can be flowed into multiple lines. The alignment of the flex items along the main axis. Defines the default behavior for how flex items are laid out along the cross axis on the current line. Aligns a flex container’s lines within when there is extra space in the cross-axis. The space between flex items in CSS em units. If this attribute is not present, then there will be no row gap. The space between flex items in CSS em units. If this attribute is not present, then there will be no column gap. Direction in which flex items are placed in the flex container. Values for the wrap attribute of flex containers. Values for the justifycontent attribute of flex containers. Values for the alignitems attribute of flex containers. Values for the aligncontent attribute of flex containers. The order of this item in the flex container. Specifies how much of the remaining space in the flex container should be assigned to this item. Flex shrink factor of this flex item. Initial main size of this flex item in CSS em units. If this attribute is not present, the size is automatically calculated. Overrides this flex item's alignitems value. A list, can be either numbered or unnumbered depending on the used format. Note that attributes such as "format" and "fullnumbering" will be inherited if a list occurs inside of another list. Format used for the automatically generated label of the items in this list. Separator used in the automatically generated label of the items in this list. Controls whether the last separator should be shown in the automatically generated label of the items in this list. Whether or not the automatically generated labels of a list item of this list should include the full numbering of all of its parent navigation items or only its number in the list of the children of its parent. Item of a list. Controls whether or not this list item increases the counter for the automatically generated labels. Custom label of this list item, overrides any automatically generated labels. One row of a table, consisting of one or multiple cells. A cell of a table row. A table consisting of rows and cells. Controls whether or not this table should have a border. Number of credit points the user gets deducted for an incorrect solution of this input element. Name of the model to use for values in this input field. If this attribute is not set, the default input model is used. Inline element for an input field in which the user can input a value that is checked against the specified solution. Desired width of this input element as a CSS length dimension. If this attribute is not set, the application will decide about the width of the input element. Block element for user input in which the user has to solve specific problems. Number of credit points the user gets awarded for this input value. Name of the model to use for this input value. If this attribute is not set, the input model associated to the input field containing this input value is used. Controls whether or not the string field should be displayed like an item of a cloze test. When set, limits the characters that the user may use to the characters occuring in the given string. Minimum length of the string that the user may enter. Maximum length of the string that the user may enter. If this attribute is not set, it defines no restrictions. Wether or not the solution should be checked in a case sensitive way or not. Whether or not to give live hints about the allowed characters when the user has not yet submitted the input value. Whether or not to give live hints about the allowed minimal length when the user has not yet submitted the input value. Whether or not to give live hints about the allowed maximal length when the user has not yet submitted the input value. Whether or not the available options should be shuffled randomly each time the page is loaded. Base of the standard positional number system in which the number is expected from the user and written in the solution. The minimum number of fractional digits (digits after the radix point) that have to be present in the users input. The maximum number of fractional digits (digits after the radix point) that have to be present in the users input. If this attribute is not present, it defines no restrictions. The minimum number of integer digits (digits before the radix point) that have to be present in the users input. The maximum number of integer digits (digits before the radix point) that have to be present in the users input. If this attribute is not present, it defines no restrictions. The number of digits of the users input after the radix point that the system takes into account for checking its value against the correct solution. Whether or not to give live hints about the minimum number of allowed fractional digits (digits after the radix point) when the user has not yet submitted the input value. Whether or not to give live hints about the maximum number of allowed fractional digits (digits after the radix point) when the user has not yet submitted the input value. Whether or not to give live hints about the minimum number of allowed integer digits (digits before the radix point) when the user has not yet submitted the input value. Whether or not to give live hints about the maximum number of allowed integer digits (digits before the radix point) when the user has not yet submitted the input value. If this value is LT and the solution is x, then any value between x-LT and x is considered a correct value. If this value is UT and the solution is x, then any value between x and x+UT is considered a correct value. If this value is LRT and the solution is x, then any value between x-LRT*|x| and x is considered a correct value. If this value is URT and the solution is x, then any value between x and x+URT*|x| is considered a correct value. Describes a valid number that can be used as base for a standard positional number system with digits and Latin characters. Since there are 9 distinct digits and 26 distinct characters in the Latin alphabet, all integers between 1 and 35 are valid base numbers. The base which is used to describe the number. If this value is LT and the solution is x, then any value between x-LT and x is considered a correct value. If this value is UT and the solution is x, then any value between x and x+UT is considered a correct value. If this value is LRT and the solution is x, then any value between x-LRT*|x| and x is considered a correct value. If this value is URT and the solution is x, then any value between x and x+URT*|x| is considered a correct value. A space-separated list of expression node types that are allowed to appear in the expression. If this attribute is not present, it defines no restrictions. A space-separated list of expression node types that must not occur anywhere in the expression. A space-separated list of expression node types that have to appear exactly once in the expression. A space-separated list of expression node types that are allowed for the root node of the expression. If this attribute is not present, it defines no restrictions. If this attribute is set to true, then the expression that the users writes into the field must be fully simplified. In particular, this means that all fractions must be reduced. Minimum number of elements that the user may put into the set. Maximum number of elements that the user may put into the set. Space-separated list of element types that the user may put into this set. If this attribute is not present, the system will automatically look for all element types that appear in the solution and offer only these types. Whether or not to give live hints about the allowed minimum size of the set when the user has not yet submitted the input value. Whether or not to give live hints about the allowed maximum size of the set when the user has not yet submitted the input value. Whether or not to give live hints about the allowed element types in the set when the user has not yet submitted the input value. Minimum number of components in this vector. Maximum number of components in this vector. Initial number of components in this vector that are already there when the user loads the page. Whether or not to give live hints about the allowed minimum size of the vector when the user has not yet submitted the input value. Whether or not to give live hints about the allowed maximum size of the vector when the user has not yet submitted the input value. Minimum number of rows in this matrix. Maximum number of rows in this matrix. Initial number of rows in this matrix that are already there when the user loads the page. Minimum number of columns in this matrix. Maximum number of columns in this matrix. Initial number of columns in this matrix that are already there when the user loads the page. Whether or not to give live hints about the allowed minimum number of rows in the matrix when the user has not yet submitted the input value. Whether or not to give live hints about the allowed maximum number of rows in the matrix when the user has not yet submitted the input value. Whether or not to give live hints about the allowed minimum number of columns in the matrix when the user has not yet submitted the input value. Whether or not to give live hints about the allowed maximum number of columns in the matrix when the user has not yet submitted the input value. Specifies whether the interval type should be already filled in for the user with the type defined in the "closed" attribute. If this attribute is set to true, the user can not change the interval type. Otherwise, the user has to specify the interval type on his or her own. A unit prefix as defined in the SI unit system. Yota Zetta Exa Peta Tera Giga Mega Kilo Hekto Deka Dezi Zenti Milli Mikro Nano Piko Femto Atto Zepto Yokto A space-separated list of unit prefixes (such as "k m d"). A symbol for a physical unit as described in the SI unit system. Shorthand for all seven SI base units (s, m, kg A, K, mol and cd). Shorthand for all SI units that are not base units. This is the opposite of SIbase. Second Meter Kilogram Ampere Kelvin Mole Candela Radian Steradian Hertz Newton Pascal Joule Watt Coulomb Volt Farad Ohm Siemens Weber Tesla Henry Celsius Lumen Lux Becquerel Gray Sievert Katal A space-separated list of unit symbols. A space-separated list of unit symbols that the user is allowed to use. If this attribute is not present, then it defines no restrictions. A space-separated list of unit symbols that the user is allowed to use. If this attribute is not present, then it defines no restrictions. A space-separated list of unit prefixes that the user is allowed to use. If this attribute is not present, then it defines no restrictions. Whether or not to give live hints about the list of allowed unit symbols when the user has not yet submitted the input value. Whether or not to give live hints about the list of forbidden unit symbols when the user has not yet submitted the input value. Whether or not to give live hints about the list of allowed unit prefixes when the user has not yet submitted the input value. Describes the type of the chemical reaction. This decides what symbol is placed between the educts and the products. Whether or not the user should only be allowed to use integer coefficients. Whether or not the terms and definitions should be shuffled randomly each time the page is loaded. Decides how often the user can use each drag item in the matching problem. Decides how often the user can use each drop item in the matching problem. Type of a chemical reaction. A reaction that should be displayed as chemical equilibrium (⇌). A reaction that should be displayed as a net foward reaction (→). A reaction that should be displayed as a reverse reaction (←). Settings element inside the inputmodel element which is used to specify the settings for string input fields. Settings element inside the inputmodel element which is used to specify the settings for order input fields. Settings element inside the inputmodel element which is used to specify the settings for matching input fields. Settings element inside the inputmodel element which is used to specify the settings for boolean input fields. Settings element inside the inputmodel element which is used to specify the settings for choice input fields. Settings element inside the inputmodel element which is used to specify the settings for number input fields. Settings element inside the inputmodel element which is used to specify the settings for exponential input fields. Settings element inside the inputmodel element which is used to specify the settings for expression input fields. Settings element inside the inputmodel element which is used to specify the settings for set input fields. Settings element inside the inputmodel element which is used to specify the settings for vector input fields. Settings element inside the inputmodel element which is used to specify the settings for matrix input fields. Settings element inside the inputmodel element which is used to specify the settings for interval input fields. Settings element inside the inputmodel element which is used to specify the settings for unit input fields. Settings element inside the inputmodel element which is used to specify the settings for quantity input fields. Settings element inside the inputmodel element which is used to specify the settings for molecular input fields. Settings element inside the inputmodel element which is used to specify the settings for reaction input fields. Input value inside an input element representing a string, such as "Hello World!". Input value representing a boolean value, either "true" or "false". Input value representing a choice out of several options. An option of a choice input value. Number of credits the users gets awarded for enabling this option. Whether or not this option is a correct solution of the input field. Input value element in which the user has to bring several items in a correct order. In the order input element, A must appear before B, B must appear before C and A must appear before D: A B C D 1 2 3 1 4 ]]> Contains the items of an order input value. An item of an order or matching input value. Contains the chains of an order input value. A chain of an order input value. Every item whose index appears in a chain before another item must be put before that item by the user. Number of credit points the user gets awarded for ordering the items in compliance with this chain. A space-separated list of one or more order or matching input value item indices. A space-separated list of positive integers. Input value element in which the user has to drag items to so-called drop items. For every correct match, the users gets a specified number of credits. In the following exercise, the user has to drag color names to RGB triples: Red Green Blue (255,0,0) (0,255,0) (0,0,255) (255,255,255) 1 1 2 2 3 3 ]]> Contains the drag items of a matching input value. Contains the drop items of a matching input value. Contains all the correct matches (pairs of drag and drop item numbers starting from 1) of a matching input value. Describes a correct match between a drag and a drop item of a matching input value. The content of this element must consist of two numbers separated by a space character. The first number is the drag item number and the second number is the drop item number (both starting from 1 from top to bottom), as defined in the parent matching element. 1 2]]> Number of credit points the user gets awarded for matching the two items. A space-separated list of exactly two numbers: a drag item number followed by a drop item number. Input value representing a number. The correct number can be either given as a direct value such as "-20.123" or as an expression that can also involve parameters defined in this containers. The expression is interpreted by the Computer Algebra System and must evaluate to a number. It is possible to specify a different base than the standard base 10. All integers between 1 and 35 are valid bases. Note that both the input from the user and the value written in the solution are interpreted as numbers with respect to the base in use. Input value representing a number in exponential notation, such as "-2.01 * 10^5". A space-separated list of expression node types. Type of a node in a binary expression tree. For example, the expression 1+x is parsed into a tree with a "sum" node as root that has two child nodes of type "number" and "variable". A number writte in positional notation, possibly with a sign. A constant like pi. A variable like x. Operator of the form a!. Operator of the form -a. Operator of the form |a|. Operator of the form sqrt(a). Operator of the form a^b. Operator of the form a*b. Operator of the form a/b. Operator of the form a+b. Operator of the form a-b.

Input value representing a mathematical expression, such as "2*x+1". The expression is parsed into a binary tree consisting of nodes that are either leafs or operators. There are three types of leaf nodes:

number (such as 1.222 or -5.55)
constant (such as pi, the full list of constants can be defined by the course or the input field)
variable (such as x, each single letter that is not a constant)

Additionally, there are the following types of operators, ordered by precedence from higher to lower. Operators on the same line have the same precedence and are processed from left to right:

faculty (a!)
negation (-a)
absolute value (|a|), square root (sqrt(a))
power (a^b)
product (a*b), fraction (a/b)
sum (a+b), difference (a-b)

Leaf nodes are considered to have the highest precedence. For example, the expression -2.22 is parsed into a single number node, while the expression -x is parsed into a tree with a negation node as root node and one node for the variable x as child node.

The user may use brackets to change the order of operators. For example, the expression -(2.22) is parsed into a tree whose root is a negation node.

The multiplication sign may be left out in situations where the meaning is clear. For example, 2xy is parsed the same as 2*x*y. But 2pi is parsed into a product of 2 with pi, because pi is a predefined constant.

Input value representing a set those elements are either text, number, expression, set, vector, matrix or interval values. For example, {1,2,3} is a set of numbers and {{1},{}} is a set of sets. The type of the element values in a set may not be mixed. A list of input value types that can appear in a set. Describes a type of input elements that can appear in a set. Number elements. Exponential elements. Expression elements. Set elements with any content. Note that it is currently not possible to restrict this type further. Vector elements with any content. Vector elements with only expression elements as content. Vector elements with only number elements as content. Vector elements with only number elements as content. Matrix elements with any content. Matrix elements with only expression elements as content. Matrix elements with only number elements as content. Matrix elements with only number elements as content. Interval elements. Interval element with only expression elements as bounds. Interval elements with only number elements as bounds. String elements. Input value representing a vector of a fixed amount of numbers or expressions. For example, (1,2,3) is a vector of numbers and (2*x,3*x,x) is a vector of expressions. Input value representing a matrix of numbers, expressions or strings. A row of a matrix input value. Specifies the type of an interval. Interval of type [a;b]. Interval of type [a;b). Interval of type (a;b). Interval of type (a;b]. Input value representing an interval, such as "[2;10)", those endpoints are numbers or expressions. Specifies the correct type of the interval. This decides which of its endpoints should belong to it. Input value representing a word in the sense of theoretical computer science, such as "aab" or the empty word "epsilon". Input value representing unit or a combination of units, such as "kg" or "m*s^-2". Input value representing a physical quantity: A combination of a number and a unit, such as "2*kg". An molecular formula input value, such as "H2O". H2O]]> Shows a chemical reaction to the user and prompts him to enter correct stoichiometric coefficients for the reagents that result in a balanced reaction. CH4 O2 H2O CO2 ]]> Contains the list of all educts of a chemical reaction. Contains the list of all products of a chemical reaction. A molecule that takes part in a chemical reaction given by a molecular formular. The format is the same as for the molecular element. H2O]]> If this attribute is present, the specified value is shown to the user as coefficient (the number in front of the molecule in the chemical reaction) and cannot be changed by the user. Otherwise, the user must enter the coefficient. Specifies whether the molecular formular (not the coefficient) should be fixed and shown to the user. If this attribute is enabled, the molecular formular is shown to the user and cannot be changed by the user. Otherwise, the user must enter the molecular formular. Calculates a decimal value from an expression that can involve parameters and replaces this element with the computed value. When a parameter with identifier a is defined in a container, one could write the following somewhere in its content: Please enter twice the value of 2*a:

]]> Same as xs:decimal, expect that the value must be strictly greater than 0. Same as xs:decimal, expect that the value must be greater than or equal to 0. A hint to a solution consisting of one or multiple steps. This element can be linked to a specific input element by setting to attribute. It then appears only as side note to this input element and not in the position of the text where it is placed itself. If the to attribute is not set, then this element appears as a collapsable box exactly where it is placed in the text. A step of a solution hint. When set, links this solution hint to the input element with the given name. A block element whose purpose is to group together boolean input fields into single or multiple choice questions. It affects all input elements with boolean values inside this element. Sets the minimum number of boolean inputs the user has to select in this boolean group. Sets a maximum number of boolean inputs the user can select in this boolean group. Sets a total maximal number of credit points the user can earn in this boolean group. Sets a total maximal number of credit points the user can get deducted in this boolean group. Allows the user to uncheck fields after they have been checked.