namespace parsing

2 files changed, 1526 insertions, 0 deletions

diff --git a/src/xml/mod.rs b/src/xml/mod.rs
new file mode 100644
index 0000000..47c1779
--- /dev/null
+++ b/src/xml/mod.rs
@@ -0,0 +1,1525 @@
+use std::char;
+
+use nom::{
+    branch::alt,
+    bytes::streaming::{is_a, tag, take, take_while},
+    character::{
+        complete::one_of,
+        streaming::{char, none_of, satisfy},
+    },
+    combinator::{map, not, opt, peek, recognize, value},
+    error::{Error, ErrorKind},
+    multi::{many0, many1, many_till},
+    sequence::{delimited, pair, preceded, separated_pair, terminated, tuple},
+    Err, IResult, Parser,
+};
+
+// parser: parses tokens from lexer into events
+// no well formedness, validity, or data model, simple translation of input into rust types
+// output is a rust representation of the input xml
+// types could be used for xml production too?
+
+mod parsers;
+
+#[derive(Clone, Debug)]
+pub enum NSAttName<'s> {
+    PrefixedAttName(PrefixedAttName<'s>),
+    DefaultAttName,
+}
+/// [1]   	NSAttName	   ::=   	PrefixedAttName | DefaultAttName
+pub fn ns_att_name(input: &str) -> IResult<&str, NSAttName> {
+    alt((
+        map(prefixed_att_name, |prefixed_att_name| {
+            NSAttName::PrefixedAttName(prefixed_att_name)
+        }),
+        value(NSAttName::DefaultAttName, default_att_name),
+    ))(input)
+}
+
+#[derive(Clone, Debug)]
+pub struct PrefixedAttName<'s>(NCName<'s>);
+/// [2]   	PrefixedAttName	   ::=   	'xmlns:' NCName
+pub fn prefixed_att_name(input: &str) -> IResult<&str, PrefixedAttName> {
+    map(preceded(tag("xmlns:"), nc_name), |nc_name| {
+        PrefixedAttName(nc_name)
+    })(input)
+}
+
+#[derive(Clone, Debug)]
+pub struct DefaultAttName;
+/// [3]   	DefaultAttName	   ::=   	'xmlns';
+pub fn default_att_name(input: &str) -> IResult<&str, DefaultAttName> {
+    value(DefaultAttName, tag("xmlns"))(input)
+}
+
+#[derive(Clone, Debug)]
+pub struct NCName<'s>(&'s str);
+/// [4]   	NCName	   ::=   	Name - (Char* ':' Char*)
+pub fn nc_name(input: &str) -> IResult<&str, NCName> {
+    map(
+        recognize(pair(
+            recognize(name_start_char).and_then(satisfy(|c| c != ':')),
+            many_till(name_char, peek(char(':'))),
+        )),
+        |nc_name| NCName(nc_name),
+    )(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum QName<'s> {
+    PrefixedName(PrefixedName<'s>),
+    UnprefixedName(UnprefixedName<'s>),
+}
+/// [7]   	QName	   ::=   	PrefixedName | UnprefixedName
+pub fn q_name(input: &str) -> IResult<&str, QName> {
+    alt((
+        map(prefixed_name, |prefixed_name| {
+            QName::PrefixedName(prefixed_name)
+        }),
+        map(unprefixed_name, |unprefixed_name| {
+            QName::UnprefixedName(unprefixed_name)
+        }),
+    ))(input)
+}
+
+#[derive(Clone, Debug)]
+pub struct PrefixedName<'s> {
+    prefix: Prefix<'s>,
+    local_part: LocalPart<'s>,
+}
+/// [8]   	PrefixedName	   ::=   	Prefix ':' LocalPart
+pub fn prefixed_name(input: &str) -> IResult<&str, PrefixedName> {
+    map(
+        separated_pair(prefix, char(':'), local_part),
+        |(prefix, local_part)| PrefixedName { prefix, local_part },
+    )(input)
+}
+
+#[derive(Clone, Debug)]
+pub struct UnprefixedName<'s>(LocalPart<'s>);
+/// [9]   	UnprefixedName	   ::=   	LocalPart
+pub fn unprefixed_name(input: &str) -> IResult<&str, UnprefixedName> {
+    map(local_part, |local_part| UnprefixedName(local_part))(input)
+}
+
+#[derive(Clone, Debug)]
+pub struct Prefix<'s>(NCName<'s>);
+/// [10]   	Prefix	   ::=   	NCName
+pub fn prefix(input: &str) -> IResult<&str, Prefix> {
+    map(nc_name, |nc_name| Prefix(nc_name))(input)
+}
+
+#[derive(Clone, Debug)]
+pub struct LocalPart<'s>(NCName<'s>);
+/// [11]   	LocalPart	   ::=   	NCName
+pub fn local_part(input: &str) -> IResult<&str, LocalPart> {
+    map(nc_name, |nc_name| LocalPart(nc_name))(input)
+}
+
+// xml spec
+
+pub type Document<'s> = (Prolog<'s>, Element<'s>, Vec<Misc<'s>>);
+/// [1]   	document	   ::=   	prolog element Misc*
+pub fn document(input: &str) -> IResult<&str, Document> {
+    tuple((prolog, element, many0(misc)))(input)
+}
+
+pub type Char = char;
+/// [2]   	Char	   ::=   	#x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]	/* any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. */
+pub fn xmlchar(input: &str) -> IResult<&str, Char> {
+    satisfy(
+        |c| matches!(c, '\u{9}' | '\u{A}' | '\u{D}' | '\u{20}'..='\u{D7FF}' | '\u{E000}'..='\u{FFFD}' | '\u{10000}'..='\u{10FFFF}'),
+    )(input)
+}
+
+pub type S<'s> = &'s str;
+/// [3]   	S	   ::=   	(#x20 | #x9 | #xD | #xA)+
+pub fn s(input: &str) -> IResult<&str, S> {
+    is_a("\u{20}\u{9}\u{D}\u{A}")(input)
+}
+
+pub type NameStartChar = char;
+/// [4]   	NameStartChar	   ::=   	":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | [#x37F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]
+pub fn name_start_char(input: &str) -> IResult<&str, NameStartChar> {
+    satisfy(
+        |c| matches!(c, ':' | 'A'..='Z' | '_' | 'a'..='z' | '\u{C0}'..='\u{D6}' | '\u{D8}'..='\u{F6}' | '\u{F8}'..='\u{2FF}' | '\u{370}'..='\u{37D}' | '\u{37F}'..='\u{1FFF}' | '\u{200C}'..='\u{200D}' | '\u{2070}'..='\u{218F}' | '\u{2C00}'..='\u{2FEF}' | '\u{3001}'..='\u{D7FF}' | '\u{F900}'..='\u{FDCF}' | '\u{FDF0}'..='\u{FFFD}' | '\u{10000}'..='\u{EFFFF}'),
+    )(input)
+}
+
+pub type NameChar = char;
+/// [4a]   	NameChar	   ::=   	NameStartChar | "-" | "." | [0-9] | #xB7 | [#x0300-#x036F] | [#x203F-#x2040]
+pub fn name_char(input: &str) -> IResult<&str, NameChar> {
+    alt((
+        name_start_char,
+        satisfy(
+            |c| matches!(c, '-' | '.' | '0'..='9' | '\u{B7}' | '\u{0300}'..='\u{036F}' | '\u{203F}'..='\u{2040}'),
+        ),
+    ))(input)
+}
+
+pub type Name<'s> = &'s str;
+/// [5]   	Name	   ::=   	NameStartChar (NameChar)*
+pub fn name(input: &str) -> IResult<&str, Name> {
+    recognize(pair(name_start_char, many0(name_char)))(input)
+}
+
+pub type Names<'s> = &'s str;
+/// [6]   	Names	   ::=   	Name (#x20 Name)*
+pub fn names(input: &str) -> IResult<&str, Names> {
+    recognize(pair(name, many0(pair(char('\u{20}'), name))))(input)
+}
+
+pub type Nmtoken<'s> = &'s str;
+/// [7]   	Nmtoken	   ::=   	(NameChar)+
+pub fn nmtoken(input: &str) -> IResult<&str, Nmtoken> {
+    recognize(many1(name_char))(input)
+}
+
+pub type Nmtokens<'s> = &'s str;
+/// [8]   	Nmtokens	   ::=   	Nmtoken (#x20 Nmtoken)*
+pub fn nmtokens(input: &str) -> IResult<&str, Nmtokens> {
+    recognize(pair(nmtoken, many0(pair(char('\u{20}'), nmtoken))))(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum LiteralData<'s> {
+    String(&'s str),
+    PEReference(PEReference<'s>),
+    Reference(Reference<'s>),
+}
+
+pub type EntityValue<'s> = Vec<LiteralData<'s>>;
+/// [9]   	EntityValue	   ::=   	'"' ([^%&"] | PEReference | Reference)* '"'
+///			|  "'" ([^%&'] | PEReference | Reference)* "'"
+pub fn entity_value(input: &str) -> IResult<&str, EntityValue> {
+    alt((
+        delimited(
+            char('"'),
+            many0(alt((
+                map(
+                    recognize(many_till(take(1usize), peek(one_of("%&\"")))),
+                    |string| LiteralData::String(string),
+                ),
+                map(pe_reference, |pe_reference| {
+                    LiteralData::PEReference(pe_reference)
+                }),
+                map(reference, |reference| LiteralData::Reference(reference)),
+            ))),
+            char('"'),
+        ),
+        delimited(
+            char('\''),
+            many0(alt((
+                map(
+                    recognize(many_till(take(1usize), peek(one_of("%&'")))),
+                    |string| LiteralData::String(string),
+                ),
+                map(pe_reference, |pe_reference| {
+                    LiteralData::PEReference(pe_reference)
+                }),
+                map(reference, |reference| LiteralData::Reference(reference)),
+            ))),
+            char('\''),
+        ),
+    ))(input)
+}
+
+pub type AttValue<'s> = Vec<LiteralData<'s>>;
+/// [10]   	AttValue	   ::=   	'"' ([^<&"] | Reference)* '"'
+/// 			|  "'" ([^<&'] | Reference)* "'"
+pub fn att_value(input: &str) -> IResult<&str, AttValue> {
+    alt((
+        delimited(
+            char('"'),
+            many0(alt((
+                map(
+                    recognize(many_till(take(1usize), peek(one_of("%&\"")))),
+                    |string| LiteralData::String(string),
+                ),
+                map(reference, |reference| LiteralData::Reference(reference)),
+            ))),
+            char('"'),
+        ),
+        delimited(
+            char('\''),
+            many0(alt((
+                map(
+                    recognize(many_till(take(1usize), peek(one_of("%&'")))),
+                    |string| LiteralData::String(string),
+                ),
+                map(reference, |reference| LiteralData::Reference(reference)),
+            ))),
+            char('\''),
+        ),
+    ))(input)
+}
+
+pub type SystemLiteral<'s> = &'s str;
+/// [11]   	SystemLiteral	   ::=   	('"' [^"]* '"') | ("'" [^']* "'")
+pub fn system_literal(input: &str) -> IResult<&str, SystemLiteral> {
+    alt((
+        delimited(char('"'), recognize(many0(none_of("\""))), char('"')),
+        delimited(char('\''), recognize(many0(none_of("'"))), char('\'')),
+    ))(input)
+}
+
+pub type PubidLiteral<'s> = &'s str;
+/// [12]   	PubidLiteral	   ::=   	'"' PubidChar* '"' | "'" (PubidChar - "'")* "'"
+pub fn pubid_literal(input: &str) -> IResult<&str, PubidLiteral> {
+    alt((
+        delimited(char('"'), recognize(many0(pubid_char)), char('"')),
+        delimited(
+            char('\''),
+            recognize(many0(recognize(not(char('\''))).and_then(pubid_char))),
+            char('\''),
+        ),
+    ))(input)
+}
+
+pub type PubidChar<'s> = char;
+/// [13]   	PubidChar	   ::=   	#x20 | #xD | #xA | [a-zA-Z0-9] | [-'()+,./:=?;!*#@$_%]
+pub fn pubid_char(input: &str) -> IResult<&str, PubidChar> {
+    satisfy(|c| matches!(c, '\u{20}' | '\u{D}' | '\u{A}' | 'a'..='z' | 'A'..='Z' | '0'..='9'))(
+        input,
+    )
+}
+
+pub type CharData<'s> = &'s str;
+/// [14]   	CharData	   ::=   	[^<&]* - ([^<&]* ']]>' [^<&]*)
+pub fn char_data(input: &str) -> IResult<&str, CharData> {
+    recognize(many_till(
+        none_of("<&"),
+        peek(alt((recognize(one_of("<&")), tag("]]>")))),
+    ))(input)
+
+    // let tagg: &str;
+    // if let Ok((_, tagg1)) = peek(take_until::<&str, &str, Error<&str>>("]]>"))(input) {
+    //     if let Ok((_, tagg2)) =
+    //         peek::<&str, &str, Error<&str>, _>(take_till(|c: char| c == '<' || c == '&'))(input)
+    //     {
+    //         if tagg1.len() < tagg2.len() {
+    //             tagg = tagg1
+    //         } else {
+    //             tagg = tagg2
+    //         }
+    //     } else {
+    //         tagg = tagg1;
+    //     }
+    // } else {
+    //     (_, tagg) = peek(take_till(|c| c == '<' || c == '&'))(input)?
+    // }
+    // tag(tagg)(input)
+
+    // recognize(many0(permutation((none_of("<&"), not(tag("]]>"))))))(input)
+    // recognize(many0(not(alt((tag("<"), tag("&"), tag("]]>"))))))(input)
+    // take_till(|c| c == '<' || c == '&').and_then(take_until("]]>"))(input)
+}
+
+pub type Comment<'s> = &'s str;
+/// Comment	   ::=   	'<!--' ((Char - '-') | ('-' (Char - '-')))* '-->'
+pub fn comment(input: &str) -> IResult<&str, Comment> {
+    delimited(
+        tag("<!--"),
+        recognize(many_till(xmlchar, peek(tag("--")))),
+        tag("-->"),
+    )(input)
+}
+
+#[derive(Clone, Debug)]
+pub struct PI<'s> {
+    target: &'s str,
+    instruction: Option<&'s str>,
+}
+/// [16]   	PI	   ::=   	'<?' PITarget (S (Char* - (Char* '?>' Char*)))? '?>'
+pub fn pi(input: &str) -> IResult<&str, PI> {
+    map(
+        delimited(
+            tag("<?"),
+            pair(
+                pi_target,
+                opt(recognize(pair(s, many_till(xmlchar, peek(tag("?>")))))),
+            ),
+            tag("?>"),
+        ),
+        |(target, instruction)| PI {
+            target,
+            instruction,
+        },
+    )(input)
+}
+
+pub type PITarget<'s> = &'s str;
+/// [17]   	PITarget	   ::=   	Name - (('X' | 'x') ('M' | 'm') ('L' | 'l'))
+pub fn pi_target(input: &str) -> IResult<&str, PITarget> {
+    let (rest, name) = name(input)?;
+    if name.to_lowercase() == "xml" {
+        return Err(Err::Error(Error {
+            input,
+            // TODO: check if better error to return
+            code: ErrorKind::Tag,
+        }));
+    } else {
+        return Ok((rest, name));
+    }
+}
+
+pub type CDSect<'s> = (CDStart<'s>, CData<'s>, CDEnd<'s>);
+/// [18]   	CDSect	   ::=   	CDStart CData CDEnd
+pub fn cd_sect(input: &str) -> IResult<&str, CDSect> {
+    tuple((cd_start, cdata, cd_end))(input)
+}
+
+pub type CDStart<'s> = &'s str;
+/// [19]   	CDStart	   ::=   	'<![CDATA['
+pub fn cd_start(input: &str) -> IResult<&str, CDStart> {
+    tag("<![CDATA[")(input)
+}
+
+pub type CData<'s> = &'s str;
+/// [20]   	CData	   ::=   	(Char* - (Char* ']]>' Char*))
+pub fn cdata(input: &str) -> IResult<&str, CData> {
+    recognize(many_till(xmlchar, peek(tag("]]>"))))(input)
+}
+
+pub type CDEnd<'s> = &'s str;
+/// [21]   	CDEnd	   ::=   	']]>'
+pub fn cd_end(input: &str) -> IResult<&str, CDEnd> {
+    tag("]]>")(input)
+}
+
+pub type Prolog<'s> = (
+    Option<XMLDecl<'s>>,
+    Vec<Misc<'s>>,
+    Option<(DoctypeDecl<'s>, Vec<Misc<'s>>)>,
+);
+/// [22]   	prolog	   ::=   	XMLDecl? Misc* (doctypedecl Misc*)?
+pub fn prolog(input: &str) -> IResult<&str, Prolog> {
+    tuple((
+        opt(xml_decl),
+        many0(misc),
+        opt(tuple((doctypedecl, many0(misc)))),
+    ))(input)
+}
+
+#[derive(Debug)]
+pub struct XMLDecl<'s> {
+    version_info: VersionInfo,
+    encoding_decl: Option<EncodingDecl<'s>>,
+    sd_decl: Option<SDDecl>,
+}
+/// [23]   	XMLDecl	   ::=   	'<?xml' VersionInfo EncodingDecl? SDDecl? S? '?>'
+pub fn xml_decl(input: &str) -> IResult<&str, XMLDecl> {
+    map(
+        delimited(
+            tag("<?xml"),
+            tuple((version_info, opt(encoding_decl), opt(sd_decl))),
+            pair(opt(s), tag("?>")),
+        ),
+        |(version_info, encoding_decl, sd_decl)| XMLDecl {
+            version_info,
+            encoding_decl,
+            sd_decl,
+        },
+    )(input)
+}
+
+pub type VersionInfo = VersionNum;
+/// [24]   	VersionInfo	   ::=   	S 'version' Eq ("'" VersionNum "'" | '"' VersionNum '"')
+pub fn version_info(input: &str) -> IResult<&str, VersionInfo> {
+    preceded(
+        tuple((s, tag("version"), eq)),
+        alt((
+            delimited(char('\''), version_num, char('\'')),
+            delimited(char('"'), version_num, char('"')),
+        )),
+    )(input)
+}
+
+/// [25]   	Eq	   ::=   	S? '=' S?
+pub fn eq(input: &str) -> IResult<&str, &str> {
+    recognize(tuple((opt(s), char('='), opt(s))))(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum VersionNum {
+    One,
+    OneDotOne,
+}
+/// [26]   	VersionNum	   ::=   	'1.' [0-9]+
+pub fn version_num(input: &str) -> IResult<&str, VersionNum> {
+    preceded(
+        tag("1."),
+        alt((
+            value(VersionNum::One, char('0')),
+            value(VersionNum::OneDotOne, char('1')),
+        )),
+    )(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum Misc<'s> {
+    Comment(Comment<'s>),
+    PI(PI<'s>),
+    // TODO: how to deal with whitespace
+    S,
+}
+/// [27]   	Misc	   ::=   	Comment | PI | S
+pub fn misc(input: &str) -> IResult<&str, Misc> {
+    alt((
+        map(comment, |comment| Misc::Comment(comment)),
+        map(pi, |pi| Misc::PI(pi)),
+        value(Misc::S, s),
+    ))(input)
+}
+
+#[derive(Debug)]
+pub struct DoctypeDecl<'s> {
+    name: QName<'s>,
+    external_id: Option<ExternalID<'s>>,
+    int_subset: Option<IntSubset<'s>>,
+}
+/// [16]   	doctypedecl	   ::=   	'<!DOCTYPE' S QName (S ExternalID)? S? ('[' (markupdecl | PEReference | S)* ']' S?)? '>'
+/// [28]   	doctypedecl	   ::=   	'<!DOCTYPE' S Name (S ExternalID)? S? ('[' intSubset ']' S?)? '>'
+pub fn doctypedecl(input: &str) -> IResult<&str, DoctypeDecl> {
+    map(
+        delimited(
+            pair(tag("<!DOCTYPE"), s),
+            tuple((
+                q_name,
+                opt(preceded(s, external_id)),
+                preceded(
+                    opt(s),
+                    opt(terminated(
+                        delimited(tag("["), int_subset, tag("]")),
+                        opt(s),
+                    )),
+                ),
+            )),
+            tag(">"),
+        ),
+        |(name, external_id, int_subset)| DoctypeDecl {
+            name,
+            external_id,
+            int_subset,
+        },
+    )(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum DeclSep<'s> {
+    PEReference(PEReference<'s>),
+    // TODO: tackle whitespace
+    S,
+}
+/// [28a]   	DeclSep	   ::=   	PEReference | S
+pub fn decl_sep(input: &str) -> IResult<&str, DeclSep> {
+    alt((
+        map(pe_reference, |pe_reference| {
+            DeclSep::PEReference(pe_reference)
+        }),
+        value(DeclSep::S, s),
+    ))(input)
+}
+
+#[derive(Debug)]
+pub enum IntSubsetDeclaration<'s> {
+    MarkupDecl(MarkupDecl<'s>),
+    DeclSep(DeclSep<'s>),
+}
+type IntSubset<'s> = Vec<IntSubsetDeclaration<'s>>;
+/// [28b]   	intSubset	   ::=   	(markupdecl | DeclSep)*
+pub fn int_subset(input: &str) -> IResult<&str, IntSubset> {
+    many0(alt((
+        map(markup_decl, |markup_decl| {
+            IntSubsetDeclaration::MarkupDecl(markup_decl)
+        }),
+        map(decl_sep, |decl_sep| IntSubsetDeclaration::DeclSep(decl_sep)),
+    )))(input)
+}
+
+#[derive(Debug)]
+pub enum MarkupDecl<'s> {
+    Elementdecl(Elementdecl<'s>),
+    AttlistDecl(AttlistDecl<'s>),
+    EntityDecl(EntityDecl<'s>),
+    NotationDecl(NotationDecl<'s>),
+    PI(PI<'s>),
+    Comment(Comment<'s>),
+}
+/// [29]   	markupdecl	   ::=   	elementdecl | AttlistDecl | EntityDecl | NotationDecl | PI | Comment
+pub fn markup_decl(input: &str) -> IResult<&str, MarkupDecl> {
+    alt((
+        map(elementdecl, |elementdecl| {
+            MarkupDecl::Elementdecl(elementdecl)
+        }),
+        map(attlist_decl, |attlist_decl| {
+            MarkupDecl::AttlistDecl(attlist_decl)
+        }),
+        map(entity_decl, |entity_decl| {
+            MarkupDecl::EntityDecl(entity_decl)
+        }),
+        map(notation_decl, |notation_decl| {
+            MarkupDecl::NotationDecl(notation_decl)
+        }),
+        map(pi, |pi| MarkupDecl::PI(pi)),
+        map(comment, |comment| MarkupDecl::Comment(comment)),
+    ))(input)
+}
+
+pub struct ExtSubset<'s> {
+    text_decl: Option<TextDecl<'s>>,
+    ext_subset_decl: ExtSubsetDecl<'s>,
+}
+/// [30]   	extSubset	   ::=   	TextDecl? extSubsetDecl
+pub fn ext_subset(input: &str) -> IResult<&str, ExtSubset> {
+    map(
+        pair(opt(text_decl), ext_subset_decl),
+        |(text_decl, ext_subset_decl)| ExtSubset {
+            text_decl,
+            ext_subset_decl,
+        },
+    )(input)
+}
+
+pub enum ExtSubsetDeclaration<'s> {
+    MarkupDecl(MarkupDecl<'s>),
+    ConditionalSect(ConditionalSect<'s>),
+    DeclSep(DeclSep<'s>),
+}
+type ExtSubsetDecl<'s> = Vec<ExtSubsetDeclaration<'s>>;
+/// [31]   	extSubsetDecl	   ::=   	( markupdecl | conditionalSect | DeclSep)*
+pub fn ext_subset_decl(input: &str) -> IResult<&str, ExtSubsetDecl> {
+    many0(alt((
+        map(markup_decl, |markup_decl| {
+            ExtSubsetDeclaration::MarkupDecl(markup_decl)
+        }),
+        map(conditional_sect, |conditional_sect| {
+            ExtSubsetDeclaration::ConditionalSect(conditional_sect)
+        }),
+        map(decl_sep, |decl_sep| ExtSubsetDeclaration::DeclSep(decl_sep)),
+    )))(input)
+}
+
+pub type SDDecl = bool;
+/// [32]   	SDDecl	   ::=   	S 'standalone' Eq (("'" ('yes' | 'no') "'") | ('"' ('yes' | 'no') '"'))
+pub fn sd_decl(input: &str) -> IResult<&str, SDDecl> {
+    preceded(
+        tuple((s, tag("standalone"), eq)),
+        alt((
+            delimited(
+                char('\''),
+                alt((value(true, tag("yes")), value(false, tag("no")))),
+                char('\''),
+            ),
+            delimited(
+                char('"'),
+                alt((value(true, tag("yes")), value(false, tag("no")))),
+                char('"'),
+            ),
+        )),
+    )(input)
+}
+
+// (Productions 33 through 38 have been removed.)
+
+#[derive(Debug, Clone)]
+pub enum Element<'s> {
+    Empty(EmptyElemTag<'s>),
+    NotEmpty(STag<'s>, Content<'s>, ETag<'s>),
+}
+/// [39]   	element	   ::=   	EmptyElemTag | STag content ETag
+pub fn element(input: &str) -> IResult<&str, Element> {
+    alt((
+        map(empty_elem_tag, |empty_elem_tag| {
+            Element::Empty(empty_elem_tag)
+        }),
+        map(tuple((s_tag, content, e_tag)), |(s_tag, content, e_tag)| {
+            Element::NotEmpty(s_tag, content, e_tag)
+        }),
+    ))(input)
+}
+
+#[derive(Debug, Clone)]
+pub struct STag<'s> {
+    name: QName<'s>,
+    attributes: Vec<Attribute<'s>>,
+}
+/// [12]   	STag	   ::=   	'<' QName (S Attribute)* S? '>'
+/// [40]   	STag	   ::=   	'<' Name (S Attribute)* S? '>'
+pub fn s_tag(input: &str) -> IResult<&str, STag> {
+    map(
+        delimited(
+            tag("<"),
+            pair(q_name, many0(preceded(s, attribute))),
+            pair(opt(s), tag(">")),
+        ),
+        |(name, attributes)| STag { name, attributes },
+    )(input)
+}
+
+#[derive(Debug, Clone)]
+pub enum Attribute<'s> {
+    NamespaceDeclaration {
+        ns_name: NSAttName<'s>,
+        value: AttValue<'s>,
+    },
+    Attribute {
+        name: QName<'s>,
+        value: AttValue<'s>,
+    },
+}
+/// [15]   	Attribute	   ::=   	NSAttName Eq AttValue | QName Eq AttValue
+pub fn attribute(input: &str) -> IResult<&str, Attribute> {
+    alt((
+        map(
+            separated_pair(ns_att_name, eq, att_value),
+            |(ns_name, value)| Attribute::NamespaceDeclaration { ns_name, value },
+        ),
+        map(separated_pair(q_name, eq, att_value), |(name, value)| {
+            Attribute::Attribute { name, value }
+        }),
+    ))(input)
+}
+// pub type Attribute<'s> = (Name<'s>, AttValue<'s>);
+/// [41]   	Attribute	   ::=   	Name Eq AttValue
+// pub fn attribute(input: &str) -> IResult<&str, Attribute> {
+//     separated_pair(name, eq, att_value)(input)
+// }
+
+#[derive(Debug, Clone)]
+pub struct ETag<'s> {
+    name: QName<'s>,
+}
+/// [13]   	ETag	   ::=   	'</' QName S? '>'
+/// [42]   	ETag	   ::=   	'</' Name S? '>'
+pub fn e_tag(input: &str) -> IResult<&str, ETag> {
+    map(
+        delimited(tag("</"), q_name, pair(opt(s), tag(">"))),
+        |name| ETag { name },
+    )(input)
+}
+
+#[derive(Debug, Clone)]
+pub enum ContentItem<'s> {
+    // CharData(&'s str),
+    Element(Element<'s>),
+    Reference(Reference<'s>),
+    CDSect(CDSect<'s>),
+    PI(PI<'s>),
+    Comment(Comment<'s>),
+}
+#[derive(Debug, Clone)]
+pub struct Content<'s> {
+    char_data: Option<CharData<'s>>,
+    content: Vec<(ContentItem<'s>, Option<CharData<'s>>)>,
+}
+/// [43]   	content	   ::=   	CharData? ((element | Reference | CDSect | PI | Comment) CharData?)*
+pub fn content(input: &str) -> IResult<&str, Content> {
+    map(
+        pair(
+            opt(char_data),
+            many0(pair(
+                alt((
+                    map(element, |element| ContentItem::Element(element)),
+                    map(reference, |reference| ContentItem::Reference(reference)),
+                    map(cd_sect, |cd_sect| ContentItem::CDSect(cd_sect)),
+                    map(pi, |pi| ContentItem::PI(pi)),
+                    map(comment, |comment| ContentItem::Comment(comment)),
+                )),
+                opt(char_data),
+            )),
+        ),
+        |(char_data, content)| Content { char_data, content },
+    )(input)
+}
+
+#[derive(Debug, Clone)]
+pub struct EmptyElemTag<'s> {
+    name: QName<'s>,
+    attributes: Vec<Attribute<'s>>,
+}
+/// [14]   	EmptyElemTag	   ::=   	'<' QName (S Attribute)* S? '/>'
+/// [44]   	EmptyElemTag	   ::=   	'<' Name (S Attribute)* S? '/>'	[WFC: Unique Att Spec]
+pub fn empty_elem_tag(input: &str) -> IResult<&str, EmptyElemTag> {
+    map(
+        delimited(
+            tag("<"),
+            pair(q_name, many0(preceded(s, attribute))),
+            pair(opt(s), tag("/>")),
+        ),
+        |(name, attributes)| EmptyElemTag { name, attributes },
+    )(input)
+}
+
+#[derive(Debug)]
+pub struct Elementdecl<'s> {
+    name: QName<'s>,
+    contentspec: Contentspec<'s>,
+}
+/// [17]   	elementdecl	   ::=   	'<!ELEMENT' S QName S contentspec S? '>'
+/// [45]   	elementdecl	   ::=   	'<!ELEMENT' S Name S contentspec S? '>'
+pub fn elementdecl(input: &str) -> IResult<&str, Elementdecl> {
+    map(
+        delimited(
+            pair(tag("<!ELEMENT"), s),
+            separated_pair(q_name, s, contentspec),
+            pair(opt(s), tag(">")),
+        ),
+        |(name, contentspec)| Elementdecl { name, contentspec },
+    )(input)
+}
+
+// TODO: casings???
+#[derive(Clone, Debug)]
+pub enum Contentspec<'s> {
+    Empty,
+    Any,
+    Mixed(Mixed<'s>),
+    Children(Children<'s>),
+}
+/// [46]   	contentspec	   ::=   	'EMPTY' | 'ANY' | Mixed | children
+pub fn contentspec(input: &str) -> IResult<&str, Contentspec> {
+    alt((
+        value(Contentspec::Empty, tag("EMPTY")),
+        value(Contentspec::Any, tag("ANY")),
+        map(mixed, |mixed| Contentspec::Mixed(mixed)),
+        map(children, |children| Contentspec::Children(children)),
+    ))(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum Occurence {
+    Once,
+    Optional,
+    Many0,
+    Many1,
+}
+/// Occurence ::= ('?' | '*' | '+')?
+pub fn occurence(input: &str) -> IResult<&str, Occurence> {
+    map(
+        opt(alt((tag("?"), tag("*"), tag("+")))),
+        |occurence| match occurence {
+            Some("?") => Occurence::Optional,
+            Some("*") => Occurence::Many0,
+            Some("+") => Occurence::Many1,
+            _ => Occurence::Once,
+        },
+    )(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum ChildrenKind<'s> {
+    Choice(Choice<'s>),
+    Seq(Seq<'s>),
+}
+#[derive(Clone, Debug)]
+pub struct Children<'s> {
+    kind: ChildrenKind<'s>,
+    occurence: Occurence,
+}
+/// [47]   	children	   ::=   	(choice | seq) ('?' | '*' | '+')?
+pub fn children(input: &str) -> IResult<&str, Children> {
+    map(
+        pair(
+            alt((
+                map(choice, |choice| ChildrenKind::Choice(choice)),
+                map(seq, |seq| ChildrenKind::Seq(seq)),
+            )),
+            occurence,
+        ),
+        |(kind, occurence)| Children { kind, occurence },
+    )(input)
+    // alt((
+    //     map(pair(choice, occurence), |(choice, occurence)| Children::Choice(choice, occurence)),
+    //     map(pair(seq, occurence), |(seq, occurence)| Children::Seq(seq, occurence))
+    // ))(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum CpKind<'s> {
+    Name(QName<'s>),
+    Choice(Choice<'s>),
+    Seq(Seq<'s>),
+}
+#[derive(Clone, Debug)]
+pub struct Cp<'s> {
+    kind: CpKind<'s>,
+    occurence: Occurence,
+}
+/// [18]   	cp	   ::=   	(QName | choice | seq) ('?' | '*' | '+')?
+/// [48]   	cp	   ::=   	(Name | choice | seq) ('?' | '*' | '+')?
+pub fn cp(input: &str) -> IResult<&str, Cp> {
+    map(
+        pair(
+            alt((
+                map(q_name, |name| CpKind::Name(name)),
+                map(choice, |choice| CpKind::Choice(choice)),
+                map(seq, |seq| CpKind::Seq(seq)),
+            )),
+            occurence,
+        ),
+        |(kind, occurence)| Cp { kind, occurence },
+    )(input)
+}
+
+#[derive(Clone, Debug)]
+pub struct Choice<'s>(Vec<Cp<'s>>);
+/// [49]   	choice	   ::=   	'(' S? cp ( S? '|' S? cp )+ S? ')'
+pub fn choice(input: &str) -> IResult<&str, Choice> {
+    map(
+        delimited(
+            pair(tag("("), opt(s)),
+            pair(cp, many1(preceded(tuple((opt(s), tag("|"), opt(s))), cp))),
+            pair(opt(s), tag(")")),
+        ),
+        |(head, tail)| {
+            let choice = vec![vec![head], tail].concat();
+            Choice(choice)
+        },
+    )(input)
+}
+
+#[derive(Clone, Debug)]
+pub struct Seq<'s>(Vec<Cp<'s>>);
+/// [50]   	seq	   ::=   	'(' S? cp ( S? ',' S? cp )* S? ')'
+pub fn seq(input: &str) -> IResult<&str, Seq> {
+    map(
+        delimited(
+            pair(tag("("), opt(s)),
+            pair(cp, many0(preceded(tuple((opt(s), tag(","), opt(s))), cp))),
+            pair(opt(s), tag(")")),
+        ),
+        |(head, tail)| {
+            let seq = vec![vec![head], tail].concat();
+            Seq(seq)
+        },
+    )(input)
+}
+
+// always contains #PCDATA
+#[derive(Clone, Debug)]
+pub struct Mixed<'s>(Vec<QName<'s>>);
+/// [19]   	Mixed	   ::=   	'(' S? '#PCDATA' (S? '|' S? QName)* S? ')*' | '(' S? '#PCDATA' S? ')'
+/// [51]   	Mixed	   ::=   	'(' S? '#PCDATA' (S? '|' S? Name)* S? ')*' | '(' S? '#PCDATA' S? ')'
+pub fn mixed(input: &str) -> IResult<&str, Mixed> {
+    alt((
+        map(
+            delimited(
+                tuple((tag("("), s, tag("#PCDATA"))),
+                many0(preceded(tuple((opt(s), tag("|"), opt(s))), q_name)),
+                pair(opt(s), tag(")*")),
+            ),
+            |names| Mixed(names),
+        ),
+        value(
+            Mixed(Vec::new()),
+            tuple((tag("("), opt(s), tag("#PCDATA"), opt(s), tag(")"))),
+        ),
+    ))(input)
+}
+
+#[derive(Debug)]
+pub struct AttlistDecl<'s> {
+    element_type: QName<'s>,
+    att_defs: Vec<AttDef<'s>>,
+}
+/// [20]   	AttlistDecl	   ::=   	'<!ATTLIST' S QName AttDef* S? '>'
+/// [52]   	AttlistDecl	   ::=   	'<!ATTLIST' S Name AttDef* S? '>'
+pub fn attlist_decl(input: &str) -> IResult<&str, AttlistDecl> {
+    map(
+        delimited(
+            pair(tag("<!ATTLIST"), s),
+            pair(q_name, many0(att_def)),
+            pair(opt(s), tag(">")),
+        ),
+        |(element_type, att_defs)| AttlistDecl {
+            element_type,
+            att_defs,
+        },
+    )(input)
+}
+
+#[derive(Debug)]
+pub enum AttDefName<'s> {
+    QName(QName<'s>),
+    NSAttName(NSAttName<'s>),
+}
+#[derive(Debug)]
+pub struct AttDef<'s> {
+    name: AttDefName<'s>,
+    att_type: AttType<'s>,
+    default_decl: DefaultDecl<'s>,
+}
+/// [21]   	AttDef	   ::=   	S (QName | NSAttName) S AttType S DefaultDecl
+/// [53]   	AttDef	   ::=   	S Name S AttType S DefaultDecl
+pub fn att_def(input: &str) -> IResult<&str, AttDef> {
+    map(
+        tuple((
+            preceded(
+                s,
+                alt((
+                    map(q_name, |q_name| AttDefName::QName(q_name)),
+                    map(ns_att_name, |ns_att_name| {
+                        AttDefName::NSAttName(ns_att_name)
+                    }),
+                )),
+            ),
+            preceded(s, att_type),
+            preceded(s, default_decl),
+        )),
+        |(name, att_type, default_decl)| AttDef {
+            name,
+            att_type,
+            default_decl,
+        },
+    )(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum AttType<'s> {
+    StringType,
+    TokenizedType(TokenizedType),
+    EnumeratedType(EnumeratedType<'s>),
+}
+/// [54]   	AttType	   ::=   	StringType | TokenizedType | EnumeratedType
+pub fn att_type(input: &str) -> IResult<&str, AttType> {
+    alt((
+        value(AttType::StringType, string_type),
+        map(tokenized_type, |tokenized_type| {
+            AttType::TokenizedType(tokenized_type)
+        }),
+        map(enumerated_type, |enumerated_type| {
+            AttType::EnumeratedType(enumerated_type)
+        }),
+    ))(input)
+}
+
+pub type StringType<'s> = &'s str;
+/// [55]   	StringType	   ::=   	'CDATA'
+pub fn string_type(input: &str) -> IResult<&str, StringType> {
+    tag("CDATA")(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum TokenizedType {
+    ID,
+    IDRef,
+    IDRefs,
+    Entity,
+    Entities,
+    NMToken,
+    NMTokens,
+}
+/// [56]   	TokenizedType	   ::=   	'ID' | 'IDREF' | 'IDREFS' | 'ENTITY' | 'ENTITIES' | 'NMTOKEN' | 'NMTOKENS'
+pub fn tokenized_type(input: &str) -> IResult<&str, TokenizedType> {
+    alt((
+        value(TokenizedType::ID, tag("ID")),
+        // TODO: check if this is required
+        // try idrefs first to avoid losing 'S'
+        value(TokenizedType::IDRefs, tag("IDREFS")),
+        value(TokenizedType::IDRef, tag("IDREF")),
+        value(TokenizedType::Entity, tag("ENTITY")),
+        value(TokenizedType::Entities, tag("ENTITIES")),
+        // same here
+        value(TokenizedType::NMTokens, tag("NMTOKENS")),
+        value(TokenizedType::NMToken, tag("NMTOKEN")),
+    ))(input)
+}
+
+#[derive(Debug, Clone)]
+pub enum EnumeratedType<'s> {
+    NotationType(NotationType<'s>),
+    Enumeration(Enumeration<'s>),
+}
+/// [57]   	EnumeratedType	   ::=   	NotationType | Enumeration
+pub fn enumerated_type(input: &str) -> IResult<&str, EnumeratedType> {
+    alt((
+        map(notation_type, |notation_type| {
+            EnumeratedType::NotationType(notation_type)
+        }),
+        map(enumeration, |enumeration| {
+            EnumeratedType::Enumeration(enumeration)
+        }),
+    ))(input)
+}
+
+#[derive(Debug, Clone)]
+pub struct NotationType<'s>(Vec<Name<'s>>);
+/// [58]   	NotationType	   ::=   	'NOTATION' S '(' S? Name (S? '|' S? Name)* S? ')'
+pub fn notation_type(input: &str) -> IResult<&str, NotationType> {
+    map(
+        delimited(
+            tuple((tag("NOTATION"), s, tag("("), opt(s))),
+            pair(
+                name,
+                many0(preceded(tuple((opt(s), tag("|"), opt(s))), name)),
+            ),
+            pair(opt(s), tag(")")),
+        ),
+        |(head, tail)| {
+            let notation_type = vec![vec![head], tail].concat();
+            NotationType(notation_type)
+        },
+    )(input)
+}
+
+#[derive(Debug, Clone)]
+pub struct Enumeration<'s>(Vec<Nmtoken<'s>>);
+/// [59]   	Enumeration	   ::=   	'(' S? Nmtoken (S? '|' S? Nmtoken)* S? ')'
+pub fn enumeration(input: &str) -> IResult<&str, Enumeration> {
+    map(
+        delimited(
+            pair(tag("("), opt(s)),
+            pair(
+                nmtoken,
+                many0(preceded(tuple((opt(s), tag("|"), opt(s))), nmtoken)),
+            ),
+            pair(opt(s), tag(")")),
+        ),
+        |(head, tail)| {
+            let enumeration = vec![vec![head], tail].concat();
+            Enumeration(enumeration)
+        },
+    )(input)
+}
+
+#[derive(Debug, Clone)]
+pub enum DefaultDecl<'s> {
+    Required,
+    Implied,
+    Fixed(AttValue<'s>),
+}
+/// [60]   	DefaultDecl	   ::=   	'#REQUIRED' | '#IMPLIED' | (('#FIXED' S)? AttValue)
+pub fn default_decl(input: &str) -> IResult<&str, DefaultDecl> {
+    alt((
+        value(DefaultDecl::Required, tag("#REQUIRED")),
+        value(DefaultDecl::Implied, tag("#IMPLIED")),
+        map(
+            preceded(opt(pair(tag("#FIXED"), s)), att_value),
+            |att_value| DefaultDecl::Fixed(att_value),
+        ),
+    ))(input)
+}
+
+pub enum ConditionalSect<'s> {
+    IncludeSect(IncludeSect<'s>),
+    IgnoreSect(IgnoreSect<'s>),
+}
+/// [61]   	conditionalSect	   ::=   	includeSect | ignoreSect
+pub fn conditional_sect(input: &str) -> IResult<&str, ConditionalSect> {
+    alt((
+        map(include_sect, |include_sect| {
+            ConditionalSect::IncludeSect(include_sect)
+        }),
+        map(ignore_sect, |ignore_sect| {
+            ConditionalSect::IgnoreSect(ignore_sect)
+        }),
+    ))(input)
+}
+
+pub struct IncludeSect<'s>(ExtSubsetDecl<'s>);
+/// [62]   	includeSect	   ::=   	'<![' S? 'INCLUDE' S? '[' extSubsetDecl ']]>'
+pub fn include_sect(input: &str) -> IResult<&str, IncludeSect> {
+    map(
+        delimited(
+            tuple((tag("<!["), opt(s), tag("INCLUDE"), opt(s), tag("["))),
+            ext_subset_decl,
+            tag("]]>"),
+        ),
+        |ext_subset_decl| IncludeSect(ext_subset_decl),
+    )(input)
+}
+
+pub struct IgnoreSect<'s>(Vec<IgnoreSectContents<'s>>);
+/// [63]   	ignoreSect	   ::=   	'<![' S? 'IGNORE' S? '[' ignoreSectContents* ']]>'
+pub fn ignore_sect(input: &str) -> IResult<&str, IgnoreSect> {
+    map(
+        delimited(
+            tuple((tag("<!["), opt(s), tag("IGNORE"), opt(s), tag("["))),
+            many0(ignore_sect_contents),
+            tag("]]>"),
+        ),
+        |ignore_sect_contents| IgnoreSect(ignore_sect_contents),
+    )(input)
+}
+
+pub struct IgnoreSectContents<'s> {
+    // TODO: what the fuck does this mean
+    ignore: Ignore<'s>,
+    ignore_list: Vec<(IgnoreSectContents<'s>, Ignore<'s>)>,
+}
+/// [64]   	ignoreSectContents	   ::=   	Ignore ('<![' ignoreSectContents ']]>' Ignore)*
+pub fn ignore_sect_contents(input: &str) -> IResult<&str, IgnoreSectContents> {
+    map(
+        pair(
+            ignore,
+            many0(tuple((
+                delimited(tag("<!["), ignore_sect_contents, tag("]]>")),
+                ignore,
+            ))),
+        ),
+        |(ignore, ignore_list)| IgnoreSectContents {
+            ignore,
+            ignore_list,
+        },
+    )(input)
+}
+
+pub type Ignore<'s> = &'s str;
+/// [65]   	Ignore	   ::=   	Char* - (Char* ('<![' | ']]>') Char*)
+pub fn ignore(input: &str) -> IResult<&str, Ignore> {
+    recognize(many_till(xmlchar, peek(alt((tag("<!["), tag("]]>"))))))(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum CharRef<'s> {
+    Decimal(&'s str),
+    Hexadecimal(&'s str),
+}
+/// [66]   	CharRef	   ::=   	'&#' [0-9]+ ';' | '&#x' [0-9a-fA-F]+ ';'
+pub fn char_ref(input: &str) -> IResult<&str, CharRef> {
+    alt((
+        delimited(
+            tag("&#"),
+            map(take_while(|c| matches!(c, '0'..='9')), |decimal| {
+                CharRef::Decimal(decimal)
+            }),
+            tag(";"),
+        ),
+        delimited(
+            tag("&#x"),
+            map(
+                take_while(|c| matches!(c, '0'..='9' | 'a'..='f' | 'A'..='F' )),
+                |hexadecimal| CharRef::Hexadecimal(hexadecimal),
+            ),
+            tag(";"),
+        ),
+    ))(input)
+}
+
+#[derive(Clone, Debug)]
+pub enum Reference<'s> {
+    EntityRef(EntityRef<'s>),
+    CharRef(CharRef<'s>),
+}
+/// [67]   	Reference	   ::=   	EntityRef | CharRef
+pub fn reference(input: &str) -> IResult<&str, Reference> {
+    alt((
+        map(entity_ref, |entity_ref| Reference::EntityRef(entity_ref)),
+        map(char_ref, |char_ref| Reference::CharRef(char_ref)),
+    ))(input)
+}
+
+pub type EntityRef<'s> = &'s str;
+/// [68]   	EntityRef	   ::=   	'&' Name ';'
+pub fn entity_ref(input: &str) -> IResult<&str, EntityRef> {
+    delimited(tag("&"), name, tag(";"))(input)
+}
+
+pub type PEReference<'s> = &'s str;
+/// [69]   	PEReference	   ::=   	'%' Name ';'
+pub fn pe_reference(input: &str) -> IResult<&str, PEReference> {
+    delimited(tag("%"), name, tag(";"))(input)
+}
+
+#[derive(Debug)]
+pub enum EntityDecl<'s> {
+    GEDecl(GEDecl<'s>),
+    PEDecl(PEDecl<'s>),
+}
+/// [70]   	EntityDecl	   ::=   	GEDecl | PEDecl
+pub fn entity_decl(input: &str) -> IResult<&str, EntityDecl> {
+    alt((
+        map(ge_decl, |ge_decl| EntityDecl::GEDecl(ge_decl)),
+        map(pe_decl, |pe_decl| EntityDecl::PEDecl(pe_decl)),
+    ))(input)
+}
+
+#[derive(Debug)]
+pub struct GEDecl<'s> {
+    name: Name<'s>,
+    entity_def: EntityDef<'s>,
+}
+/// [71]   	GEDecl	   ::=   	'<!ENTITY' S Name S EntityDef S? '>'
+pub fn ge_decl(input: &str) -> IResult<&str, GEDecl> {
+    map(
+        delimited(
+            pair(tag("<!ENTITY"), s),
+            separated_pair(name, s, entity_def),
+            pair(opt(s), tag(">")),
+        ),
+        |(name, entity_def)| GEDecl { name, entity_def },
+    )(input)
+}
+
+#[derive(Debug)]
+pub struct PEDecl<'s> {
+    name: Name<'s>,
+    pe_def: PEDef<'s>,
+}
+/// [72]   	PEDecl	   ::=   	'<!ENTITY' S '%' S Name S PEDef S? '>'
+pub fn pe_decl(input: &str) -> IResult<&str, PEDecl> {
+    map(
+        delimited(
+            tuple((tag("<!ENTITY"), s, tag("%"), s)),
+            separated_pair(name, s, pe_def),
+            pair(opt(s), tag(">")),
+        ),
+        |(name, pe_def)| PEDecl { name, pe_def },
+    )(input)
+}
+
+#[derive(Debug)]
+pub enum EntityDef<'s> {
+    EntityValue(EntityValue<'s>),
+    ExternalID {
+        external_id: ExternalID<'s>,
+        ndata_decl: Option<NDataDecl<'s>>,
+    },
+}
+/// [73]   	EntityDef	   ::=   	EntityValue | (ExternalID NDataDecl?)
+pub fn entity_def(input: &str) -> IResult<&str, EntityDef> {
+    alt((
+        map(entity_value, |entity_value| {
+            EntityDef::EntityValue(entity_value)
+        }),
+        map(
+            pair(external_id, opt(ndata_decl)),
+            |(external_id, ndata_decl)| EntityDef::ExternalID {
+                external_id,
+                ndata_decl,
+            },
+        ),
+    ))(input)
+}
+
+#[derive(Debug)]
+pub enum PEDef<'s> {
+    EntityValue(EntityValue<'s>),
+    ExternalID(ExternalID<'s>),
+}
+/// [74]   	PEDef	   ::=   	EntityValue | ExternalID
+pub fn pe_def(input: &str) -> IResult<&str, PEDef> {
+    alt((
+        map(entity_value, |entity_value| {
+            PEDef::EntityValue(entity_value)
+        }),
+        map(external_id, |external_id| PEDef::ExternalID(external_id)),
+    ))(input)
+}
+
+#[derive(Debug)]
+pub enum ExternalID<'s> {
+    SYSTEM {
+        system_identifier: &'s str,
+    },
+    PUBLIC {
+        public_identifier: &'s str,
+        system_identifier: &'s str,
+    },
+}
+/// [75]   	ExternalID	   ::=   	'SYSTEM' S SystemLiteral | 'PUBLIC' S PubidLiteral S SystemLiteral
+// pub fn external_id(input: &str) -> IResult<&str, ExternalID> {
+pub fn external_id(input: &str) -> IResult<&str, ExternalID> {
+    alt((
+        map(
+            preceded(pair(tag("SYSTEM"), s), system_literal),
+            |system_identifier| ExternalID::SYSTEM { system_identifier },
+        ),
+        map(
+            preceded(
+                pair(tag("PUBLIC"), s),
+                separated_pair(pubid_literal, s, system_literal),
+            ),
+            |(public_identifier, system_identifier)| ExternalID::PUBLIC {
+                public_identifier,
+                system_identifier,
+            },
+        ),
+    ))(input)
+}
+
+pub type NDataDecl<'s> = &'s str;
+/// [76]   	NDataDecl	   ::=   	S 'NDATA' S Name
+pub fn ndata_decl(input: &str) -> IResult<&str, NDataDecl> {
+    preceded(tuple((s, tag("NDATA"), s)), name)(input)
+}
+
+pub struct TextDecl<'s> {
+    version_info: Option<VersionInfo>,
+    encoding_decl: EncodingDecl<'s>,
+}
+/// [77]   	TextDecl	   ::=   	'<?xml' VersionInfo? EncodingDecl S? '?>'
+pub fn text_decl(input: &str) -> IResult<&str, TextDecl> {
+    map(
+        delimited(
+            tag("<?xml"),
+            pair(opt(version_info), terminated(encoding_decl, opt(s))),
+            tag("?>"),
+        ),
+        |(version_info, encoding_decl)| TextDecl {
+            version_info,
+            encoding_decl,
+        },
+    )(input)
+}
+
+pub struct ExtParsedEnt<'s> {
+    text_decl: Option<TextDecl<'s>>,
+    content: Content<'s>,
+}
+/// [78]   	extParsedEnt	   ::=   	TextDecl? content
+pub fn ext_parsed_ent(input: &str) -> IResult<&str, ExtParsedEnt> {
+    map(pair(opt(text_decl), content), |(text_decl, content)| {
+        ExtParsedEnt { text_decl, content }
+    })(input)
+}
+
+pub type EncodingDecl<'s> = EncName<'s>;
+/// [80]   	EncodingDecl	   ::=   	S 'encoding' Eq ('"' EncName '"' | "'" EncName
+pub fn encoding_decl(input: &str) -> IResult<&str, EncodingDecl> {
+    preceded(
+        tuple((s, tag("encoding"), eq)),
+        alt((
+            delimited(char('"'), enc_name, char('"')),
+            delimited(char('\''), enc_name, char('\'')),
+        )),
+    )(input)
+}
+
+pub type EncName<'s> = &'s str;
+/// [81]   	EncName	   ::=   	[A-Za-z] ([A-Za-z0-9._] | '-')*
+pub fn enc_name(input: &str) -> IResult<&str, EncName> {
+    recognize(pair(
+        satisfy(|c| matches!(c, 'A'..='Z' | 'a'..='z' )),
+        many0(satisfy(
+            |c| matches!(c, 'A'..='Z' | 'a'..='z' | '0'..='9' | '.' | '_' | '-' ),
+        )),
+    ))(input)
+}
+
+#[derive(Debug)]
+pub struct NotationDecl<'s> {
+    name: &'s str,
+    id: NotationDeclID<'s>,
+}
+#[derive(Debug)]
+pub enum NotationDeclID<'s> {
+    External(ExternalID<'s>),
+    Public(PublicID<'s>),
+}
+/// [82]   	NotationDecl	   ::=   	'<!NOTATION' S Name S (ExternalID | PublicID) S? '>'
+pub fn notation_decl(input: &str) -> IResult<&str, NotationDecl> {
+    map(
+        delimited(
+            pair(tag("<!NOTATION"), s),
+            separated_pair(
+                name,
+                s,
+                alt((
+                    map(external_id, |external_id| {
+                        NotationDeclID::External(external_id)
+                    }),
+                    map(public_id, |public_id| NotationDeclID::Public(public_id)),
+                )),
+            ),
+            pair(opt(s), tag(">")),
+        ),
+        |(name, id)| NotationDecl { name, id },
+    )(input)
+}
+
+pub type PublicID<'s> = &'s str;
+/// [83]   	PublicID	   ::=   	'PUBLIC' S PubidLiteral
+pub fn public_id(input: &str) -> IResult<&str, PublicID> {
+    preceded(pair(tag("PUBLIC"), s), pubid_literal)(input)
+}
+
+#[cfg(test)]
+mod tests {
+    use std::num::NonZero;
+
+    use super::*;
+
+    #[test]
+    fn test_char_data() {
+        assert_eq!(Ok(("&def]]>ghi", "abc")), char_data("abc&def]]>ghi"));
+        assert_eq!(Ok(("]]>ghi", "abcdef")), char_data("abcdef]]>ghi"));
+        assert_eq!(Ok(("&defghi", "abc")), char_data("abc&defghi"));
+        assert_eq!(Ok(("]]>def&ghi", "abc")), char_data("abc]]>def&ghi"));
+        assert_eq!(Ok(("&ghi", "abc]>def")), char_data("abc]>def&ghi"));
+        assert_eq!(
+            Err(Err::Incomplete(nom::Needed::Size(
+                NonZero::new(3usize).unwrap()
+            ))),
+            char_data("abcdefghi")
+        );
+    }
+
+    #[test]
+    fn test_comment() {
+        assert_eq!(Ok(("", "")), comment("<!---->"));
+        assert_eq!(Ok(("", "asdf")), comment("<!--asdf-->"));
+        assert_eq!(Ok(("", "as-df")), comment("<!--as-df-->"));
+        assert_eq!(
+            Err(Err::Incomplete(nom::Needed::Size(
+                NonZero::new(2usize).unwrap()
+            ))),
+            comment("<!--asdf")
+        );
+    }
+
+    #[test]
+    fn test_pi_target() {
+        assert_eq!(Ok((" ", "asdf")), pi_target("asdf "));
+        assert_eq!(Ok((" ", "xmlasdf")), pi_target("xmlasdf "));
+        assert_eq!(
+            Err(Err::Error(Error {
+                input: "xml ",
+                code: ErrorKind::Tag
+            })),
+            pi_target("xml ")
+        );
+        assert_eq!(
+            Err(Err::Error(Error {
+                input: "xMl ",
+                code: ErrorKind::Tag
+            })),
+            pi_target("xMl ")
+        );
+    }
+
+    #[test]
+    fn test_cd_sect() {
+        assert_eq!(
+            Ok((
+                "",
+                ("<![CDATA[", "<greeting>Hello, world!</greeting>", "]]>")
+            )),
+            cd_sect("<![CDATA[<greeting>Hello, world!</greeting>]]>")
+        )
+    }
+
+    #[test]
+    fn test_cd_start() {
+        assert_eq!(Ok(("asdf", "<![CDATA[")), cd_start("<![CDATA[asdf"))
+    }
+
+    #[test]
+    fn test_cdata() {
+        assert_eq!(Ok(("]]>asdf", "asdf")), cdata("asdf]]>asdf"));
+        assert_eq!(
+            Ok(("]]>asdf", "<![CDATA[asdf")),
+            cdata("<![CDATA[asdf]]>asdf")
+        );
+        assert_eq!(
+            Ok(("]]>asdf", "<greeting>Hello, world!</greeting>")),
+            cdata("<greeting>Hello, world!</greeting>]]>asdf")
+        )
+    }
+
+    #[test]
+    fn test_cd_end() {
+        assert_eq!(Ok(("asdf", "]]>")), cd_end("]]>asdf"))
+    }
+}
diff --git a/src/xml/parsers.rs b/src/xml/parsers.rs
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/src/xml/parsers.rs
@@ -0,0 +1 @@
+