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diff --git a/libparc/parc/algol/parc_URI.h b/libparc/parc/algol/parc_URI.h
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file parc_URI.h
+ * @ingroup networking
+ * @brief A Universal Resource Identifier
+ *
+ * An RF2396 compliant URI implementation with facilities for composition, decomposition,
+ * comparison, manipulation, etc.
+ *
+ */
+#ifndef libparc_parc_URI_h
+#define libparc_parc_URI_h
+
+#include <parc/algol/parc_URIPath.h>
+#include <parc/algol/parc_BufferComposer.h>
+
+struct parc_uri;
+typedef struct parc_uri PARCURI;
+
+/**
+ * Create a new `PARCURI` object.
+ *
+ * The new `PARCURI` object is empty.
+ *
+ * @return A pointer to a `PARCURI` instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCURI *uri = parcURI_Create();
+ *     ...
+ *     parcURI_Release(&uri);
+ * }
+ * @endcode
+ */
+PARCURI *parcURI_Create(void);
+
+/**
+ * Create a new instance of `PARCURI` from the given format string and arguments.
+ *
+ * @param [in] format A pointer to a nul-terminated printf format string
+ * @param [in] argList A pointer to a valid `va_list`
+ *
+ * @return non-NULL A pointer to a valid PARCURI instance.
+ * @return NULL An error occurred.
+ *
+ * Example:
+ * @code
+ * {
+ *     char *
+ *     createFormatString(const char * restrict format, ...)
+ *     {
+ *         va_list argList;
+ *         va_start(argList, format);
+ *
+ *         PARCURI *uri = parcURI_CreateFromValist(format, argList);
+ *
+ *         va_end(argList);
+ *         return uri;
+ *     }
+ * }
+ * @endcode
+ */
+PARCURI *parcURI_CreateFromValist(const char *restrict format, va_list argList);
+
+/**
+ * Create a new instance of `PARCURI` from the given format string and variable number of parameters.
+ *
+ * @param [in] format A pointer to a nul-terminated printf format string
+ * @param [in] ... A variable number of parameters.
+ *
+ * @return non-NULL A pointer to a valid PARCURI instance.
+ * @return NULL An error occurred.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCURI *uri = parcURI_CreateFromFormatString("http://%s/index.html", "127.0.0.1");
+ * }
+ * @endcode
+ */
+PARCURI *parcURI_CreateFromFormatString(const char *restrict format, ...);
+
+/**
+ * Increase the number of references to a `PARCURI` instance.
+ *
+ * Note that new `PARCURI` is not created,
+ * only that the given `PARCURI` reference count is incremented.
+ * Discard the reference by invoking {@link parcURI_Release}.
+ *
+ * @param uri A pointer to the original instance.
+ * @return The value of the input parameter @p instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCURI *x = parcURI_Create();
+ *
+ *     PARCURI *x2 = parcURI_Acquire(x);
+ *
+ *     parcURI_Release(&x);
+ *     parcURI_Release(&x2);
+ * }
+ * @endcode
+ *
+ * @see parcURI_Release
+ */
+PARCURI *parcURI_Acquire(const PARCURI *uri);
+
+/**
+ * Release a previously acquired reference to the specified instance,
+ * decrementing the reference count for the instance.
+ *
+ * The pointer to the instance is set to NULL as a side-effect of this function.
+ *
+ * If the invocation causes the last reference to the instance to be released,
+ * the instance is deallocated and the instance's implementation will perform
+ * additional cleanup and release other privately held references.
+ *
+ * @param [in,out] uriPtr A pointer to a pointer to the instance to release.
+ *
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCURI *x = parcURI_Create();
+ *
+ *     parcURI_Release(&x);
+ * }
+ * @endcode
+ */
+void parcURI_Release(PARCURI **uriPtr);
+
+/**
+ * Parse a well-formed URI into a `PARCURI` instance.
+ *
+ *   The URI string must be null-terminated so that parsing can detect the
+ *   end of the path correctly.
+ *
+ * @param [in] string The URI C-string used to create the `PARCURI` instance.
+ *
+ * @return non-NULL A pointer to an allocated `PARCURI` structure which must be destroyed via {@link parcURI_Release()}.
+ * @return NULL The URI was malformed.
+ *
+ * Example:
+ * @code
+ * {
+ *     const char *uriString = "http://parc.com";
+ *
+ *     PARCURI *uri = parcURI_Parse(uriString);
+ *     if (uri == NULL) {
+ *         printf("Malformed URI '%s', uriString);
+ *     }
+ * }
+ * @endcode
+ */
+PARCURI *parcURI_Parse(const char *string);
+
+/**
+ * Create a deep copy of the given `PARCURI` instance.
+ *
+ * @param [in] uri A `PARCURI` pointer.
+ *
+ * @return A deep copy of the given `PARCURI` instance.
+ *
+ * Example:
+ * @code
+ * {
+ *     const char *uriString = "http://parc.com";
+ *     PARCURI *uri = parcURI_Parse(uriString);
+ *
+ *     PARCURI *copy = parcURI_Copy(uri);
+ *     // uri and copy will contain equivalent paths
+ *
+ *     parcURI_Release(&uri);
+ *     parcURI_Release(&copy);
+ * }
+ * @endcode
+ */
+PARCURI *parcURI_Copy(const PARCURI *uri);
+
+/**
+ * Return true if two `PARCURI` instances are equal.
+ *
+ * The following equivalence relations on non-null `PARCURI` instances are maintained:
+ *
+ *   * It is reflexive: for any non-null reference value x, equals(x, x) must return true.
+ *
+ *   * It is symmetric: for any non-null reference values x and y, equals(x, y) must return true if and only if
+ *        equals(y x) returns true.
+ *
+ *   * It is transitive: for any non-null reference values x, y, and z, if
+ *        equals(x, y) returns true and
+ *        equals(y, z) returns true,
+ *        then  equals(x, z) must return true.
+ *
+ *   * It is consistent: for any non-null reference values x and y, multiple invocations of equals(x, y)
+ *         consistently return true or consistently return false.
+ *
+ *   * For any non-null reference value x, equals(x, NULL)) must return false.
+ *
+ * @param [in] uriA The first `PARCURI` instance.
+ * @param [in] uriB The second `PARCURI` instance.
+ *
+ * @return true the given `PARCURI` instances are equal.
+ * @return false the given `PARCURI` instances are not equal.
+ *
+ * Example:
+ * @code
+ * {
+ *     const char *uriString = "http://parc.com";
+ *     PARCURI *uri = parcURI_Parse(uriString);
+ *     PARCURI *copy = parcURI_Copy(uri);
+ *
+ *     if (parcURI_Equals(uri, copy)) {
+ *         printf("Paths are equal.\n");
+ *     } else {
+ *         printf("Paths are NOT equal.\n");
+ *     }
+ *
+ *     parcURI_Release(&uri);
+ *     parcURI_Release(&copy);
+ * }
+ * @endcode
+ */
+bool parcURI_Equals(const PARCURI *uriA, const PARCURI *uriB);
+
+/**
+ * Get the scheme part of the given URI.
+ *
+ * The scheme of a URI path is the "type", e.g., labeled content
+ * identifier "lci" for "lci:/foo/bar".
+ *
+ * @param [in] uri A `PARCURI` pointer.
+ *
+ * @return char* The scheme of the given `PARCURI` instance
+ * @return NULL If no scheme is available.
+ *
+ * Example:
+ * @code
+ * {
+ *     const char *uriString = "http://parc.com";
+ *     PARCURI *uri = parcURI_Parse(uriString);
+ *
+ *     const char *scheme = parcURI_GetScheme(uri); // will be "lci"
+ *
+ *     parcURI_Release(&uri);
+ * }
+ * @endcode
+ */
+const char *parcURI_GetScheme(const PARCURI *uri);
+
+/**
+ * Get the authority part of the given `PARCURI`.
+ *
+ * The authority part of a URI is the string: username at host:port
+ *
+ * @param [in] uri A `PARCURI` pointer.
+ *
+ * @return char* The authority of the given `PARCURI` instance
+ * @return NULL If no scheme is available.
+ *
+ * Example:
+ * @code
+ * {
+ *     const char *uriString = "http://chris@parc.com:80";
+ *     PARCURI *uri = parcURI_Parse(uriString);
+ *
+ *     const char *authority = parcURI_GetAuthority(uri); // will be "chris@parc.com:80"
+ *
+ *     parcURI_Release(&uri);
+ * }
+ * @endcode
+ */
+const char *parcURI_GetAuthority(const PARCURI *uri);
+
+/**
+ * Get the {@link PARCURIPath} part of the given URI.
+ *
+ *   Every `PARCURI` contains a `PARCURIPath` consisting of the path portion of the URI.
+ *
+ * @param [in] uri A `PARCURI` pointer.
+ *
+ * @return The `PARCURIPath` part of the given URI.
+ *
+ * Example:
+ * @code
+ * {
+ *     const char *uriString = "http://parc.com/foo/bar/";
+ *     PARCURI *uri = parcURI_Parse(uriString);
+ *
+ *     const char *path = parcURI_GetPath(uri); // will be "/foo/bar/"
+ *
+ *     parcURI_Release(&uri);
+ * }
+ * @endcode
+ */
+PARCURIPath *parcURI_GetPath(const PARCURI *uri);
+
+/**
+ * Get the query part of the given PARCURI`.
+ *
+ *   Queries are contiguous key-value string segments of a URI.
+ *   For example, the query of URI string "http://parc.com/x=1&y=2&z=3" is "x=1&y=2&z=3"
+ *
+ * @param [in] uri A `PARCURI` pointer.
+ *
+ * @return char* The query string, if present, for the given URI
+ * @return NULL If no query string is present
+ *
+ * Example:
+ * @code
+ * {
+ *     const char *uriString = "http://parc.com/x=1&y=2&z=3";
+ *     PARCURI *uri = parcURI_Parse(uriString);
+ *
+ *     const char *path = parcURI_GetQuery(uri); // will be "x=1&y=2&z=3"
+ *
+ *     parcURI_Release(&uri);
+ * }
+ * @endcode
+ */
+const char *parcURI_GetQuery(const PARCURI *uri);
+
+/**
+ * Get the fragment part of the given `PARCURI`.
+ *
+ *   The fragment of a URI is the string component following the '#' character.
+ *   For example, the fragment of URI string "http://parc.com/index.html#info" is "info"
+ *
+ * @param [in] uri A `PARCURI` pointer.
+ *
+ * @return char* The fragment of the URI, if present
+ * @return NULL If no fragment is in the URI
+ *
+ * Example:
+ * @code
+ * {
+ *     const char *uriString = "http://parc.com/index.html#info";
+ *     PARCURI *uri = parcURI_Parse(uriString);
+ *
+ *     const char *path = parcURI_GetFragment(uri); // will be "info"
+ *
+ *     parcURI_Release(&uri);
+ * }
+ * @endcode
+ */
+const char *parcURI_GetFragment(const PARCURI *uri);
+
+/**
+ * Append a representation of the specified `PARCURI` instance to the given `PARCBufferComposer`.
+ *
+ * @param [in] uri A pointer to a `PARCURI` instance whose representation should be appended to the @p composer.
+ * @param [in,out] composer A pointer to a `PARCBufferComposer` instance to be modified.
+ *
+ * @return NULL Cannot allocate memory.
+ * @return non-NULL The @p composer.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCBufferComposer *result = parcBufferComposer_Create();
+ *
+ *     parcURI_BuildString(instance, result);
+ *
+ *     char *string = parcBufferComposer_ToString(result);
+ *     printf("Hello: %s\n", string);
+ *     parcMemory_Deallocate(string);
+ *
+ *     parcBufferComposer_Release(&result);
+ * }
+ * @endcode
+ */
+PARCBufferComposer *parcURI_BuildString(const PARCURI *uri, PARCBufferComposer *composer);
+
+/**
+ * Produce an allocated null-terminated string representation of the given URI.
+ *
+ *   The returned value must be destroyed via `parcMemory_Deallocate`
+ *
+ * @param [in] uri The `PARCURI` instance to format.
+ *
+ * @return An allocated null-terminated string representation of the given URI.
+ *
+ * Example:
+ * @code
+ * {
+ *     const char *uriString = "http://parc.com";
+ *     PARCURI *uri = parcURI_Parse(uriString);
+ *
+ *     printf("path string = %s\n", parcURI_ToString(uri));
+ *
+ *     parcURI_Release(&uri);
+ * }
+ * @endcode
+ */
+char *parcURI_ToString(const PARCURI *uri);
+#endif // libparc_parc_URI_h