[Xml] Flesh out most of the documentation.

libraries/xml.md

@@ -23,40 +23,84 @@ existing XML documents.
 
 ### Rosella.Xml.Tag
 
+* `child_tag_finder_name_attrs`:
 * `child_tag_finder_attrs`:
 
 ## Classes
 
 ### Rosella.Xml.Document
 
+`Rosella.Xml.Document` is an object representing an entire XML document. It
+contains the entity information along with headers and other metadata.
+Documents can be created from parsing a string of existing XML markup or by
+creating it directly.
+
 ### Rosella.Xml.DtdDocument
 
+`Rosella.Xml.DtdDocument` represents a DTD document. It can be created from
+parsing a DTD definition, by parsing an XML document with DTD information
+included inline, or by creating it directly.
+
 ### Rosella.Xml.Tag
 
+`Rosella.Xml.Tag` represents a complete XML tag, including attributes and
+child contents.
+
 ### Rosella.Xml.Tag.EndTag
 
+An end tag </foo>
+
 ### Rosella.Xml.Tag.XmlHeader
 
+`Rosella.Xml.Tag.XmlHeader` represents an `<?xml ... ?>` tag at the beginning
+of the document, typically with version or encoding information.
+
 ### Rosella.Xml.Tag.DtdHeader
 
+`Rosella.Xml.Tag.DtdHeader` represents a `<!DOCTYPE ...?>` tag at the beginning
+of the document with schema information.
+
 ### Rosella.Xml.Tag.DtdElement
 
+`Rosella.Xml.Tag.DtdElement` represents an `<!ELEMENT>` declaration in a DTD.
+
 ### Rosella.Xml.Tag.DtdAttlist
 
+`Rosella.Xml.Tag.DtdAttlist` represents an `<!ATTLIST>` declaration in a DTD.
+
 ### Rosella.Xml.Tag.Comment
 
+`Rosella.Xml.Tag.Comment` represents a `<!-- -->` Comment in XML
+
 ### Rosella.Xml.Tag.DocumentRoot
 
+A helper class for the parser. Not for user applications.
+
 ### Rosella.Xml.Tag.Collection
 
+`Rosella.Xml.Tag.Collection` represents a collection of Tag objects. It is an
+Iterable type.
+
 ### Rosella.Xml.Text
 
+`Rosella.Xml.Text' represents literal strings of text in the xml document.
+
 ### Rosella.Xml.Visitor
 
+`Rosella.Xml.Visitor` implements a visitor pattern for algorithms that need to
+visit and operate on all nodes in the document recursively.
+
 ### Rosella.Xml.Visitor.Lister
 
+`Rosella.Xml.Visitor.Lister` is an example visitor type which creates a list of
+all nodes in the document.
+
 ### Rosella.Xml.Visitor.DtdValidator
 
+`Rosella.Xml.Visitor.DtdValidator` performs validation of an XML document
+according to a given DTD document. It returns a flag for whether the document
+passes validation, and a list of error messages if it does not.
+
 ## Winxed Include Files
 
 ## Examples