`<source>`

A source is a resource from which the present topic is derived, either completely or in part.

Usage information

The <source> element contains a description of the resource. Alternatively, the @href or @keyref attributes can be used to reference a description of the resource.

Processing expectations

It is undefined what it means when the <source> element has both content and an attribute-based reference to another resource. It is up to the implementation to determine the processing for this situation.

Content model

Contained by

<prolog>

Zero or more of the following

Contained by

<prolog>

Inheritance

- topic/source

The <source> element is a base element type. It is defined in the topic module.

Attributes

The following attributes are available on this element: link-relationship attributes, universal attributes, and @keyref.

For this element, the @href attribute provides a reference to a resource from which the topic is derived.

The following attributes are available on this element: universal attributes and the attributes defined below.

@format (link-relationship attributes): Specifies the format of the resource that is referenced. See The format attribute for detailed information on supported values and processing implications.
@href (link-relationship attributes): Specifies a reference to a resource. See The href attribute for detailed information on supported values and processing implications.; For this element, the @href attribute provides a reference to a resource from which the topic is derived.
@keyref: Specifies a key name that acts as a redirectable reference based on a key definition within a map. See The keyref attribute for information on using this attribute.
@scope (link-relationship attributes): Specifies the closeness of the relationship between the current document and the referenced resource. The following values are valid: local, peer, external, and -dita-use-conref-target.
See The scope attribute for detailed information on supported values and processing implications.
@type (link-relationship attributes): Describes the target of a reference. See The type attribute for detailed information on supported values and processing implications.

Example

This section is non-normative.

The following code sample shows that the content is based on information from the XML Exchange Table Model Document Type Definition:

<prolog>
    <source>XML Exchange Table Model Document Type Definition</source>
</prolog>