dtdIsAttribute function

Query if a name is a valid attribute of a DTD element.

Examines the definition of the DTD element definition identified by element to see if it supports an attribute named name.

dtdIsAttribute(name, element, dtd)

Arguments

• name: The name of the attribute being queried
• element: The name of the element whose definition is to be used to obtain the list of valid attributes.
• dtd: The DTD containing the definition of the elements, specifically element.

Returns

A logical value indicating if the list of attributes suppported by the specified element has an entry named name. This does indicate what type of value that attribute has, whether it is required, implied, fixed, etc.

References

https://www.w3.org/XML/, http://www.jclark.com/xml/, https://www.omegahat.net

Author(s)

Duncan Temple Lang

See Also

parseDTD, dtdElement, xmlAttrs

Examples

dtdFile <- system.file("exampleData", "foo.dtd", package="XML")
 foo.dtd <- parseDTD(dtdFile)

    # true
  dtdIsAttribute("numRecords", "dataset", foo.dtd)

    # false
  dtdIsAttribute("date", "dataset", foo.dtd)