Validating XML

See also valid xml documents.

LT XML is an integrated set of XML tools and a developers' tool-kit, including a C-based API. The release now available will run on UNIX and WIN32. However I am a bit unimpressed by xmlnorm.

xmlnorm -sx document.xml

xmlvalid (by ElCel Technolgy) is a free command line utility to validate xml.

validating XML against a schema (with MSXML).

See also validating HTML with onsgmls.