Checks if an entity is defined within a DTD.

A DTD contains entity and element definitions. These functions test whether a DTD contains a definition for a particular named element or entity.

xmlContainsEntity(name, dtd)
xmlContainsElement(name, dtd)

Arguments

name

The name of the element or entity being queried.

dtd

The DTD in which to search for the entry.

Details

See parseDTD for more information about DTDs, entities and elements.

Value

A logical value indicating whether the entry was found in the appropriate list of entitiy or element definitions.

References

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

Author

Duncan Temple Lang

See also

parseDTD, dtdEntity, dtdElement,

Examples

 dtdFile <- system.file("exampleData", "foo.dtd", package="XML")
 foo.dtd <- parseDTD(dtdFile)
 
  # Look for entities.
 xmlContainsEntity("foo", foo.dtd)
#> [1] FALSE
 xmlContainsEntity("bar", foo.dtd)
#> [1] FALSE

  # Now look for an element
 xmlContainsElement("record", foo.dtd)
#> [1] FALSE