Tags and attributes that do not comply with the document type are considered invalid markup and can come in any of the following forms:

Arbortext Editor contains mechanisms for validating document structures for the following conditions:

Validation processing may show that a document contains invalid markup. All errors within the document should be corrected eventually. However, Arbortext Editor will allow you to fix the errors in future sessions.

When a new document is loaded into Arbortext Editor, its document structure is analyzed for form, function, and proper SGML and XML markup compliance. If there are errors, error messages will display and the tag icons will display in red with a strikethrough effect. Once the Arbortext Editor parser finds the errors, you are not forced to make all corrections in your current session. All markup, including invalid markup, remains in the document until you correct it.