The best XML Schema indicator Tutorial In 2024, In this tutorial you can learn Indicator,Order indicator,Occurrence indicator,Group indicator,

XML Schema indicator

By the indicator, we can control the use of the elements in the document mode.

Indicator

There are seven indicators:

Order indicators:

• All
• Choice
• Sequence

Occurrence indicator:

• maxOccurs
• minOccurs

Group indicator:

• Group name
• attributeGroup name

Order indicator

Order indicators are used to define the order of the elements.

All indicator

<All> indicator in accordance with the provisions of sub-elements can appear in any order, and each child element must appear only once:

Note: When using the <all> indicator, you can put <minOccurs> is set to 0 or 1, but only the <maxOccurs> indicator is set to 1 (later explain <minOccurs> and <maxOccurs>).

Choice Indicator

<Choice> indicator provides for a sub-element occur or may occur another child element (or the other):

Sequence Indicator

<Sequence> child element must be specified in a specific order:

Occurrence indicator

Occurrence indicators are used to define the frequency of an element occur.

Note: For all of the "Order" and "Group" indicator (any, all, choice, sequence , group name and group reference), which maxOccurs and minOccurs defaults are 1.

maxOccurs indicator

<MaxOccurs> indicator can specify the maximum number of times an element can occur:

The above examples show that the child element "child_name" may appear in the least "person" element once (where the default value of minOccurs is 1), appears at most 10 times.

minOccurs indicator

<MinOccurs> indicator may require a minimum number of times an element can occur:

The above examples show that the child element "child_name" there may be a minimum of 0 in "person" element, appears at most 10 times.

Tip: To make the number of occurrences of an element is not limited, please use the maxOccurs = "unbounded" this statement:

A practical example:

Called "Myfamily.xml" XML file:

Above this XML file contains a root element named "persons" of. Inside this root element, we have defined three "person" element. Each "person" element must contain a "full_name" elements, but it may contain up to 5 "child_name" element.

This is the schema file "family.xsd":

Group indicator

Group indicator for several batches of elements related to the definition.

Element Group

Element group defined by the group declared:

You must define a statement within the group all, choice or sequence elements. The following example defines a group named "persongroup", which defines a set of elements that must be present according to a precise order:

After you have defined the group is completed, you can refer to it in another definition of:

Property group

Attribute groups defined by attributeGroup statement:

The following example defines a property group named "personattrgroup" of:

After you have defined a complete set of attributes, you can reference it in another definition, like so: