3 files changed, 52 insertions, 10 deletions
diff --git a/src/document_tree/attribute_types.rs b/src/document_tree/attribute_types.rs
index 1648c18..219a0ac 100644
--- a/src/document_tree/attribute_types.rs
+++ b/src/document_tree/attribute_types.rs
@@ -6,7 +6,7 @@ use regex::Regex;
 
 use crate::target;
 
-#[derive(Debug,PartialEq,Serialize)]
+#[derive(Debug,PartialEq,Eq,Hash,Serialize)]
 pub enum EnumeratedListType {
 	Arabic,
 	LowerAlpha,
@@ -15,16 +15,17 @@ pub enum EnumeratedListType {
 	UpperRoman,
 }
 
-#[derive(Debug,PartialEq,Serialize)]
+#[derive(Debug,PartialEq,Eq,Hash,Serialize)]
 pub enum FixedSpace { Default, Preserve }  // yes, default really is not “Default”
 impl Default for FixedSpace { fn default() -> FixedSpace { FixedSpace::Preserve } }
 
-#[derive(Debug,PartialEq,Serialize)] pub enum AlignH { Left, Center, Right}
-#[derive(Debug,PartialEq,Serialize)] pub enum AlignHV { Top, Middle, Bottom, Left, Center, Right }
+#[derive(Debug,PartialEq,Eq,Hash,Serialize)] pub enum AlignH { Left, Center, Right}
+#[derive(Debug,PartialEq,Eq,Hash,Serialize)] pub enum AlignHV { Top, Middle, Bottom, Left, Center, Right }
 
-#[derive(Debug,PartialEq,Serialize)] pub struct ID(pub String);
-#[derive(Debug,PartialEq,Serialize)] pub struct NameToken(pub String);
+#[derive(Debug,PartialEq,Eq,Hash,Serialize)] pub struct ID(pub String);
+#[derive(Debug,PartialEq,Eq,Hash,Serialize)] pub struct NameToken(pub String);
 
+// no eq for f64
 #[derive(Debug,PartialEq,Serialize)]
 pub enum Measure {  // http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html#length-units
 	Em(f64),
diff --git a/src/parser.rs b/src/parser.rs
index 89e6827..b2512cc 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -1,5 +1,6 @@
 pub mod token;
 pub mod conversion;
+mod simplify;
 mod pest_rst;
 mod pair_ext_parse;
 #[cfg(test)]
@@ -8,14 +9,20 @@ pub mod tests;
 use failure::Error;
 use pest::Parser;
 
-use crate::document_tree::elements::Document;
+use crate::document_tree::Document;
 
 use self::pest_rst::{RstParser,Rule};
 use self::conversion::convert_document;
+use self::simplify::resolve_references;
 
 
-/// tokens to Document tree. resolves sections, but not references
+/// Parse into a document tree and resolve sections, but not references.
+pub fn parse_only(source: &str) -> Result<Document, Error> {
+	let pairs = RstParser::parse(Rule::document, source)?;
+	convert_document(pairs)
+}
+
+/// Parse into a document tree and resolve sections and references. 
 pub fn parse(source: &str) -> Result<Document, Error> {
-    let pairs = RstParser::parse(Rule::document, source)?;
-    convert_document(pairs)
+	parse_only(source).map(resolve_references)
 }
diff --git a/src/parser/simplify.rs b/src/parser/simplify.rs
new file mode 100644
index 0000000..2743a69
--- /dev/null
+++ b/src/parser/simplify.rs
@@ -0,0 +1,34 @@
+use std::collections::HashMap;
+
+use crate::target::Target;
+use crate::document_tree::{
+	Document,
+	HasChildren,
+	attribute_types::ID,
+	element_categories as c,
+};
+
+
+trait ResolvableRefs {
+	fn populate_targets(&self, refs: &mut HashMap<&ID, Target>);
+	fn resolve_refs(self, refs: &HashMap<&ID, Target>) -> Self;
+}
+
+pub fn resolve_references(mut doc: Document) -> Document {
+	let mut references = HashMap::new();
+	for c in doc.children() {
+		c.populate_targets(&mut references);
+	}
+	let new: Vec<_> = doc.children_mut().drain(..).map(|c| c.resolve_refs(&references)).collect();
+	Document::with_children(new)
+}
+
+impl ResolvableRefs for c::StructuralSubElement {
+	fn populate_targets(&self, refs: &mut HashMap<&ID, Target>) {
+		//TODO
+	}
+	fn resolve_refs(self, refs: &HashMap<&ID, Target>) -> Self {
+		self //TODO
+	}
+}
+