NATURE OF CASE
In the county court for Sarpy County, John F. Keen pled guilty to having violated Neb. Rev. Stat. § 60-6,196 (Reissue 2004) and was convicted of second-offense driving while under the influence (DUI). The enhancement to second offense was based on a DUI conviction Keen received in 1998 under Omaha Mun. Code, ch. 36, art. Ill, § 36-115 (1995). In county court and on appeal to the district court, Keen unsuccessfully maintained that the 1998 conviction could not be used for enhancement purposes because it was not a “[p]rior conviction” as defined in Neb. Rev. Stat. § 60-6,197.02(l)(a) (Reissue 2004). He contended that under § 60-6,197.02(l)(a), the 1998 conviction was neither a conviction “[f]or a violation of section 60-6,196” nor a conviction “for a violation of a city or village ordinance enacted in conformance with section 60-6,196.” To support his argument, Keen cited
State v. Loyd,
*125 STANDARD OF REVIEW
The issue presented by this appeal is a question of law. On a question of law, an appellate court is obligated to reach a conclusion independent of the determination reached by the court below.
State v. Furrey,
Sentences within statutory limits will be disturbed by an appellate court only if the sentences complained of were an abuse of judicial discretion.
State
v.
Wagner,
FACTS AND PROCEDURAL BACKGROUND
On October 13, 2004, Keen was arrested for DUI. On November 19, the State charged Keen with, among other charges, second-offense DUI and alleged that he had previously been convicted of DUI in 1998. On January 13, 2005, pursuant to a plea agreement, Keen pled guilty to the DUI charge.
After accepting Keen’s plea and finding him guilty on the DUI charge, the county court held an enhancement hearing. As evidence of a prior conviction, the State offered exhibit 1, which consisted of copies of several documents related to Keen’s 1998 conviction in Douglas County under § 36-115 (1995) of the Omaha Municipal Code, a DUI ordinance. Exhibit 1 showed that on July 21, 1998, Keen was represented by counsel when he pled no contest to the DUI charge and was convicted and sentenced for that offense. The court received exhibit 1 into evidence without objection and ordered a presentence investigation.
On March 18, 2005, Keen asked the county court to reconsider its finding of second-offense DUI because his 1998 conviction was not a valid “[pjrior conviction” for enhancement purposes, given that the Omaha ordinance under which he was convicted did not conform to the state DUI statute, as required by § 60-6,197.02(l)(a). Keen cited Loyd as authority for his position. On April 8, the county court reopened the case in order to reconsider the enhancement issue, and the parties were allowed to make an evidentiary record. The court acknowledged that exhibit 1 offered by the State had already been received into evidence. Keen introduced a copy of the Omaha ordinance under which he was convicted in 1998. The court again found that Keen’s latest conviction was a second offense and proceeded to sentence him. Keen was ordered to serve 60 days in jail (with *126 credit for 1 day served) and to pay a fine of $500. The court also revoked his driver’s license for 1 year.
Keen appealed from the conviction, enhancement, and sentence to the district court, alleging the county court had erred in finding that he had a valid prior conviction, in denying probation, and in imposing an excessive sentence. The district court found that Keen was attempting to collaterally attack his 1998 conviction, in violation of
State
v.
Louthan,
Keen appealed, and this court moved the appeal to its docket on its own motion, pursuant to its statutory authority to regulate the caseloads of the appellate courts of this state. See Neb. Rev. Stat. § 24-1106(3) (Reissue 1995).
ASSIGNMENTS OF ERROR
We summarize Keen’s assignments of error as alleging the district court erred in finding (1) that Keen was attempting to collaterally attack the validity of his prior conviction, (2) that his 1998 DUI conviction under an Omaha city ordinance constituted a prior conviction for purposes of DUI sentence enhancement, and (3) that the sentence was not excessive.
ANALYSIS
Keen claims he is not making a collateral attack, on his 1998 DUI conviction under the Omaha city ordinance because he is not arguing that the 1998 conviction was invalid but that it could not be used to enhance his current DUI conviction under the state DUI statutes. State law provides for enhanced penalties when a DUI defendant has one or more prior convictions. See Neb. Rev. Stat. § 60-6,197.03 (Reissue 2004). A prior conviction, as defined in § 60-6,197.02(l)(a), includes “[a]ny conviction for a violation of a city or village ordinance enacted in conformance with section 60-6,196” which was received within the 12-year period immediately preceding the current offense.
Keen maintains that to use the 1998 conviction for enhancement purposes, the State must prove he was convicted under an ordinance which was enacted “in conformance with” the DUI statute. See § 60-6,197.02(l)(a). He bases his position on
State
*127
v.
Loyd,
Keen received his 1998 conviction under a 1995 version of § 36-115, whereas in Loyd, this court reviewed a 1998 version of the same ordinance. The 1995 version of the ordinance was slightly different from the 1998 version and was somewhat inconsistent with the controlling version of § 60-6,196. Given our conclusion in this opinion, however, we need not decide whether that distinction is significant. For purposes of this opinion, we assume that the DUI ordinance under which Keen was convicted in 1998 would be unenforceable under Loyd and that if Keen had pled not guilty and raised the issue of the ordinance’s invalidity when he was prosecuted in 1998, the ordinance would have been invalidated.
The State maintains that Keen is collaterally attacking his 1998 DUI conviction in the present case. When a judgment is attacked in a manner other than by a proceeding in the original action to have it vacated, reversed, or modified, or by a proceeding in equity to prevent its enforcement, the attack is a collateral attack.
State
v.
Smith,
In
State v. Louthan,
This court has recognized that a judgment is an adjudication of all the matters that are essential to support it, and every proposition assumed or decided by the court leading up to the final conclusion and on which such conclusion is based is as effectually passed upon as the ultimate question which is finally resolved.
Norlanco, Inc. v. County of Madison,
In
Norlanco, Inc.,
Similar reasoning was applied in
Davis Management, Inc.
v.
Sanitary & Improvement Dist. No. 276,
In the present case, we deal not with an ordinance which was declared unconstitutional but one which might have been unenforceable on the basis of the statutory interpretation adopted in
State v. Loyd,
Keen claims he is not questioning the validity of his 1998 DUI conviction but merely asserting that the conviction could not be used to enhance his current conviction given that the Omaha DUI ordinance was subsequently invalidated in
Loyd
for being inconsistent with the state DUI statute. He is in fact seeking to attack one of the determinations in the 1998 conviction, that is, that the 1995 ordinance was valid. Keen’s argument ignores the breadth of the doctrine of res judicata, which this court recognized in
Norlanco, Inc.
v.
County of Madison,
“is much broader in its application than a determination of the questions involved in the prior action; the conclusiveness of the judgment in such case extends not only to matters actually determined, but. also to other matters which *130 could properly have been raised and determined therein. The rule applies to every question relevant to and falling within the purview of the original action, in respect to matters of both claim or grounds of recovery, and defense, which could have been presented by the exercise of diligence.”
Id.
at 106,
Inherent in Keen’s 1998 conviction was a determination that the Omaha DUI ordinance to which he pled no contest and under which he was convicted was enforceable, and inherent in that determination was a finding that the city ordinance under which he was convicted was “in conformance with” the state statute. See § 60-6,197.02(l)(a). Thus, Keen could have and should have raised these issues in the 1998 prosecution.
Collateral attacks on previous proceedings are impermissible unless the attack is grounded upon the court’s lack of jurisdiction over the parties or subject matter.
State v. Smith,
We conclude that Keen’s 1998 DUI conviction was valid for the purpose of sentence enhancement and that Keen is attempting to collaterally attack that conviction. Therefore, we affirm the judgment of the district court on this issue.
Keen also assigns as error his sentence. He claims that his sentence was excessive and that he should have been sentenced to probation. His argument, however, is based upon the assumption that we would rule in his favor on the enhancement issue. His theory is that the county court should have imposed a sentence appropriate for a first-offense DUI conviction. Sentences within statutory limits will be disturbed by an appellate court only if the sentences complained of were an abuse of judicial discretion.
State v. Wagner,
*131 CONCLUSION
The district court correctly determined that Keen was attempting to collaterally attack his 1998 DUI conviction in the enhancement proceedings concerning his current DUI conviction. The district court also correctly affirmed Keen’s sentence. We affirm the judgment of the district court.
Affirmed.
