add comments

src/line/code.rs

@@ -11,16 +11,19 @@ pub struct Code {
 }
 
 impl Code {
-    // Inline
+    // Constructors
+
+    /// Parse inline `Self` from string
     pub fn inline_from(line: &str) -> Option<Inline> {
         Inline::from(line)
     }
 
-    // Multiline
+    /// Begin multi-line parse `Self` from string
     pub fn multiline_begin_from(line: &str) -> Option<Multiline> {
         Multiline::begin_from(line)
     }
 
+    /// Continue multi-line parse `Self` from string
     pub fn multiline_continue_from(this: &mut Multiline, line: &str) -> Result<(), Error> {
         match Multiline::continue_from(this, line) {
             Ok(()) => Ok(()),

src/line/code/inline.rs

@@ -1,10 +1,14 @@
 use glib::{Regex, RegexCompileFlags, RegexMatchFlags};
 
+/// Inline [preformatted](https://geminiprotocol.net/docs/gemtext-specification.gmi#in-pre-formatted-mode) entity holder
 pub struct Inline {
     pub value: String,
 }
 
 impl Inline {
+    // Constructors
+
+    /// Parse `Self` from string
     pub fn from(line: &str) -> Option<Self> {
         // Parse line
         let regex = Regex::split_simple(

src/line/code/multiline.rs

@@ -1,9 +1,12 @@
 pub mod error;
 pub use error::Error;
 
+// Shared defaults
+
 pub const NEW_LINE: char = '\n';
 pub const TAG: &str = "```";
 
+/// Multi-line [preformatted](https://geminiprotocol.net/docs/gemtext-specification.gmi#in-pre-formatted-mode) entity holder
 pub struct Multiline {
     pub alt: Option<String>,
     pub value: String,
@@ -11,6 +14,8 @@ pub struct Multiline {
 }
 
 impl Multiline {
+    // Constructors
+
     /// Search in line for tag open,
     /// return Self constructed on success or None
     pub fn begin_from(line: &str) -> Option<Self> {

src/line/header.rs

@@ -1,17 +1,22 @@
 use glib::{GString, Regex, RegexCompileFlags, RegexMatchFlags};
 
+/// [Header](https://geminiprotocol.net/docs/gemtext-specification.gmi#heading-lines) type holder
 pub enum Level {
     H1,
     H2,
     H3,
 }
 
+/// [Header](https://geminiprotocol.net/docs/gemtext-specification.gmi#heading-lines) entity holder
 pub struct Header {
     pub value: GString,
     pub level: Level,
 }
 
 impl Header {
+    // Constructors
+
+    /// Parse `Self` from string
     pub fn from(line: &str) -> Option<Self> {
         // Parse line
         let regex = Regex::split_simple(

src/line/link.rs

@@ -1,5 +1,6 @@
 use glib::{DateTime, Regex, RegexCompileFlags, RegexMatchFlags, TimeZone, Uri, UriFlags};
 
+/// [Link](https://geminiprotocol.net/docs/gemtext-specification.gmi#link-lines) entity holder
 pub struct Link {
     pub alt: Option<String>,         // [optional] alternative link description
     pub is_external: Option<bool>,   // [optional] external link indication, on base option provided
@@ -8,6 +9,9 @@ pub struct Link {
 }
 
 impl Link {
+    // Constructors
+
+    /// Parse `Self` from string
     pub fn from(line: &str, base: Option<&Uri>, timezone: Option<&TimeZone>) -> Option<Self> {
         // Define initial values
         let mut alt = None;

src/line/list.rs

@@ -1,11 +1,13 @@
 use glib::{Regex, RegexCompileFlags, RegexMatchFlags};
 
-/// [List item](https://geminiprotocol.net/docs/gemtext-specification.gmi#list-items)
+/// [List](https://geminiprotocol.net/docs/gemtext-specification.gmi#list-items) entity holder
 pub struct List {
     pub value: String,
 }
 
 impl List {
+    // Constructors
+
     /// Parse `Self` from string
     pub fn from(line: &str) -> Option<Self> {
         // Parse line

src/line/quote.rs

@@ -1,10 +1,14 @@
 use glib::{Regex, RegexCompileFlags, RegexMatchFlags};
 
+/// [Quote](https://geminiprotocol.net/docs/gemtext-specification.gmi#quote-lines) entity holder
 pub struct Quote {
     pub value: String,
 }
 
 impl Quote {
+    // Constructors
+
+    /// Parse `Self` from string
     pub fn from(line: &str) -> Option<Self> {
         // Parse line
         let regex = Regex::split_simple(