It also can describe the values that can be placed into any element or attribute.DTD was the first formalized standard, but is rarely used anymore.
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Attributes may be named and defined at the top level, and then referenced by name elsewhere.
Such definitions may contain these attributes: indicates the default value of an attribute or element; the default value is assumed for an attribute that does not appear, or for an element with empty content.
It is possible to select several children as a composite field, but that is not discussed further here.
A Following are descriptions of XML Schema features that are more advanced, and best avoided until needed.
The character data allowed for a complex type with simple content may be restricted in all the ways that a simple type can (see child element.
Attributes may be defined globally, referenced, or defined locally.
The XSD standard has evolved over a number of years, and is controlled by the W3C.
It is extremely comprehensive, and as a result has become rather complex.
There are several ways one schema can incorporate types, elements, attributes, and groups defined in another schema (besides simply copying the text, which always works).